Update Docker files

This pull request basically add `apt-get update` command before doing anything apt-releated (see logs below) and change the syntax to tag a machine (as was not working with -t="name" ***on my machine***)

Host: Ubuntu 14.04 64bit
Docker: 1.0.0

From `docker/setup`:

```
antonio :: ~PROJECTS/GitElephant/docker ‹develop› » ./setup 
[sudo] password for antonio: 
Sending build context to Docker daemon  2.56 kB
Sending build context to Docker daemon 
Step 0 : FROM ubuntu:14.04
 ---> ad892dd21d60
Step 1 : MAINTAINER Matteo Giachino matteog@gmail.com
 ---> Using cache
 ---> e7c46eba5063
Step 2 : ENV GITVERSION 1.9.2
 ---> Using cache
 ---> 5f61ebd1fb40
Step 3 : RUN apt-get install -y php5
 ---> Running in 12d850f74579
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  apache2 apache2-bin apache2-data libapache2-mod-php5 libapr1 libaprutil1
  libaprutil1-dbd-sqlite3 libaprutil1-ldap libasn1-8-heimdal libedit2
  libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
  libheimntlm0-heimdal libhx509-5-heimdal libkrb5-26-heimdal libldap-2.4-2
  libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db
  libwind0-heimdal libxml2 lsof openssl php5-cli php5-common php5-json
  php5-readline psmisc sgml-base ssl-cert xml-core
Suggested packages:
  www-browser apache2-doc apache2-suexec-pristine apache2-suexec-custom ufw
  apache2-utils php-pear libsasl2-modules-otp libsasl2-modules-ldap
  libsasl2-modules-sql libsasl2-modules-gssapi-mit
  libsasl2-modules-gssapi-heimdal ca-certificates php5-user-cache
  sgml-base-doc openssl-blacklist debhelper
The following NEW packages will be installed:
  apache2 apache2-bin apache2-data libapache2-mod-php5 libapr1 libaprutil1
  libaprutil1-dbd-sqlite3 libaprutil1-ldap libasn1-8-heimdal libedit2
  libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
  libheimntlm0-heimdal libhx509-5-heimdal libkrb5-26-heimdal libldap-2.4-2
  libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db
  libwind0-heimdal libxml2 lsof openssl php5 php5-cli php5-common php5-json
  php5-readline psmisc sgml-base ssl-cert xml-core
0 upgraded, 34 newly installed, 0 to remove and 12 not upgraded.
Need to get 8692 kB of archives.
After this operation, 33.9 MB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty/main libroken18-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [40.0 kB]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty/main libasn1-8-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [160 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty/main libedit2 amd64 3.1-20130712-2 [86.7 kB]
Get:4 http://archive.ubuntu.com/ubuntu/ trusty/main libhcrypto4-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [84.0 kB]
Get:5 http://archive.ubuntu.com/ubuntu/ trusty/main libheimbase1-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [29.0 kB]
Get:6 http://archive.ubuntu.com/ubuntu/ trusty/main libwind0-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [47.8 kB]
Get:7 http://archive.ubuntu.com/ubuntu/ trusty/main libhx509-5-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [104 kB]
Get:8 http://archive.ubuntu.com/ubuntu/ trusty/main libkrb5-26-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [197 kB]
Get:9 http://archive.ubuntu.com/ubuntu/ trusty/main libheimntlm0-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [15.2 kB]
Get:10 http://archive.ubuntu.com/ubuntu/ trusty/main libgssapi3-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [90.1 kB]
Get:11 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-modules-db amd64 2.1.25.dfsg1-17build1 [14.9 kB]
Get:12 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-2 amd64 2.1.25.dfsg1-17build1 [56.5 kB]
Get:13 http://archive.ubuntu.com/ubuntu/ trusty/main libldap-2.4-2 amd64 2.4.31-1+nmu2ubuntu8 [154 kB]
Get:14 http://archive.ubuntu.com/ubuntu/ trusty/main sgml-base all 1.26+nmu4ubuntu1 [12.5 kB]
Get:15 http://archive.ubuntu.com/ubuntu/ trusty/main libapr1 amd64 1.5.0-1 [85.1 kB]
Get:16 http://archive.ubuntu.com/ubuntu/ trusty/main libaprutil1 amd64 1.5.3-1 [76.4 kB]
Get:17 http://archive.ubuntu.com/ubuntu/ trusty/main psmisc amd64 22.20-1ubuntu2 [53.2 kB]
Get:18 http://archive.ubuntu.com/ubuntu/ trusty/main lsof amd64 4.86+dfsg-1ubuntu2 [257 kB]
Get:19 http://archive.ubuntu.com/ubuntu/ trusty/main php5-json amd64 1.3.2-2build1 [34.4 kB]
Get:20 http://archive.ubuntu.com/ubuntu/ trusty/main php5-common amd64 5.5.9+dfsg-1ubuntu4 [439 kB]
Get:21 http://archive.ubuntu.com/ubuntu/ trusty/main php5-cli amd64 5.5.9+dfsg-1ubuntu4 [2163 kB]
Get:22 http://archive.ubuntu.com/ubuntu/ trusty/main php5-readline amd64 5.5.9+dfsg-1ubuntu4 [12.1 kB]
Get:23 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-modules amd64 2.1.25.dfsg1-17build1 [64.3 kB]
Get:24 http://archive.ubuntu.com/ubuntu/ trusty/main xml-core all 0.13+nmu2 [23.3 kB]
Get:25 http://archive.ubuntu.com/ubuntu/ trusty/main libaprutil1-dbd-sqlite3 amd64 1.5.3-1 [10.5 kB]
Get:26 http://archive.ubuntu.com/ubuntu/ trusty/main libaprutil1-ldap amd64 1.5.3-1 [8634 B]
Get:27 http://archive.ubuntu.com/ubuntu/ trusty/main apache2-bin amd64 2.4.7-1ubuntu4 [839 kB]
Get:28 http://archive.ubuntu.com/ubuntu/ trusty/main apache2-data all 2.4.7-1ubuntu4 [160 kB]
Get:29 http://archive.ubuntu.com/ubuntu/ trusty/main apache2 amd64 2.4.7-1ubuntu4 [87.7 kB]
Get:30 http://archive.ubuntu.com/ubuntu/ trusty/main libapache2-mod-php5 amd64 5.5.9+dfsg-1ubuntu4 [2210 kB]
Get:31 http://archive.ubuntu.com/ubuntu/ trusty/main php5 all 5.5.9+dfsg-1ubuntu4 [1302 B]
Get:32 http://archive.ubuntu.com/ubuntu/ trusty/main ssl-cert all 1.0.33 [16.6 kB]
Err http://archive.ubuntu.com/ubuntu/ trusty-security/main libxml2 amd64 2.9.1+dfsg1-3ubuntu4.1
  404  Not Found [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com/ubuntu/ trusty-security/main openssl amd64 1.0.1f-1ubuntu2.1
  404  Not Found [IP: 91.189.92.200 80]
Fetched 7633 kB in 8s (921 kB/s)
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libx/libxml2/libxml2_2.9.1+dfsg1-3ubuntu4.1_amd64.deb  404  Not Found [IP: 91.189.92.200 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_1.0.1f-1ubuntu2.1_amd64.deb  404  Not Found [IP: 91.189.92.200 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
2014/06/10 18:45:04 The command [/bin/sh -c apt-get install -y php5] returned a non-zero code: 100
Sending build context to Docker daemon  2.56 kB
Sending build context to Docker daemon 
Step 0 : FROM ubuntu:14.04
 ---> ad892dd21d60
Step 1 : MAINTAINER Matteo Giachino matteog@gmail.com
 ---> Using cache
 ---> e7c46eba5063
Step 2 : ENV GITVERSION 1.8.5.3
 ---> Using cache
 ---> 4dc754e9cd86
Step 3 : RUN apt-get install -y php5
 ---> Running in 991d2207dbdf
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  apache2 apache2-bin apache2-data libapache2-mod-php5 libapr1 libaprutil1
  libaprutil1-dbd-sqlite3 libaprutil1-ldap libasn1-8-heimdal libedit2
  libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
  libheimntlm0-heimdal libhx509-5-heimdal libkrb5-26-heimdal libldap-2.4-2
  libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db
  libwind0-heimdal libxml2 lsof openssl php5-cli php5-common php5-json
  php5-readline psmisc sgml-base ssl-cert xml-core
Suggested packages:
  www-browser apache2-doc apache2-suexec-pristine apache2-suexec-custom ufw
  apache2-utils php-pear libsasl2-modules-otp libsasl2-modules-ldap
  libsasl2-modules-sql libsasl2-modules-gssapi-mit
  libsasl2-modules-gssapi-heimdal ca-certificates php5-user-cache
  sgml-base-doc openssl-blacklist debhelper
The following NEW packages will be installed:
  apache2 apache2-bin apache2-data libapache2-mod-php5 libapr1 libaprutil1
  libaprutil1-dbd-sqlite3 libaprutil1-ldap libasn1-8-heimdal libedit2
  libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
  libheimntlm0-heimdal libhx509-5-heimdal libkrb5-26-heimdal libldap-2.4-2
  libroken18-heimdal libsasl2-2 libsasl2-modules libsasl2-modules-db
  libwind0-heimdal libxml2 lsof openssl php5 php5-cli php5-common php5-json
  php5-readline psmisc sgml-base ssl-cert xml-core
0 upgraded, 34 newly installed, 0 to remove and 12 not upgraded.
Need to get 8692 kB of archives.
After this operation, 33.9 MB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty/main libroken18-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [40.0 kB]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty/main libasn1-8-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [160 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty/main libedit2 amd64 3.1-20130712-2 [86.7 kB]
Get:4 http://archive.ubuntu.com/ubuntu/ trusty/main libhcrypto4-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [84.0 kB]
Get:5 http://archive.ubuntu.com/ubuntu/ trusty/main libheimbase1-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [29.0 kB]
Get:6 http://archive.ubuntu.com/ubuntu/ trusty/main libwind0-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [47.8 kB]
Get:7 http://archive.ubuntu.com/ubuntu/ trusty/main libhx509-5-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [104 kB]
Get:8 http://archive.ubuntu.com/ubuntu/ trusty/main libkrb5-26-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [197 kB]
Get:9 http://archive.ubuntu.com/ubuntu/ trusty/main libheimntlm0-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [15.2 kB]
Get:10 http://archive.ubuntu.com/ubuntu/ trusty/main libgssapi3-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1 [90.1 kB]
Get:11 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-modules-db amd64 2.1.25.dfsg1-17build1 [14.9 kB]
Get:12 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-2 amd64 2.1.25.dfsg1-17build1 [56.5 kB]
Get:13 http://archive.ubuntu.com/ubuntu/ trusty/main libldap-2.4-2 amd64 2.4.31-1+nmu2ubuntu8 [154 kB]
Get:14 http://archive.ubuntu.com/ubuntu/ trusty/main sgml-base all 1.26+nmu4ubuntu1 [12.5 kB]
Get:15 http://archive.ubuntu.com/ubuntu/ trusty/main libapr1 amd64 1.5.0-1 [85.1 kB]
Get:16 http://archive.ubuntu.com/ubuntu/ trusty/main libaprutil1 amd64 1.5.3-1 [76.4 kB]
Get:17 http://archive.ubuntu.com/ubuntu/ trusty/main psmisc amd64 22.20-1ubuntu2 [53.2 kB]
Get:18 http://archive.ubuntu.com/ubuntu/ trusty/main lsof amd64 4.86+dfsg-1ubuntu2 [257 kB]
Get:19 http://archive.ubuntu.com/ubuntu/ trusty/main php5-json amd64 1.3.2-2build1 [34.4 kB]
Get:20 http://archive.ubuntu.com/ubuntu/ trusty/main php5-common amd64 5.5.9+dfsg-1ubuntu4 [439 kB]
Get:21 http://archive.ubuntu.com/ubuntu/ trusty/main php5-cli amd64 5.5.9+dfsg-1ubuntu4 [2163 kB]
Get:22 http://archive.ubuntu.com/ubuntu/ trusty/main php5-readline amd64 5.5.9+dfsg-1ubuntu4 [12.1 kB]
Get:23 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-modules amd64 2.1.25.dfsg1-17build1 [64.3 kB]
Get:24 http://archive.ubuntu.com/ubuntu/ trusty/main xml-core all 0.13+nmu2 [23.3 kB]
Get:25 http://archive.ubuntu.com/ubuntu/ trusty/main libaprutil1-dbd-sqlite3 amd64 1.5.3-1 [10.5 kB]
Get:26 http://archive.ubuntu.com/ubuntu/ trusty/main libaprutil1-ldap amd64 1.5.3-1 [8634 B]
Get:27 http://archive.ubuntu.com/ubuntu/ trusty/main apache2-bin amd64 2.4.7-1ubuntu4 [839 kB]
Get:28 http://archive.ubuntu.com/ubuntu/ trusty/main apache2-data all 2.4.7-1ubuntu4 [160 kB]
Get:29 http://archive.ubuntu.com/ubuntu/ trusty/main apache2 amd64 2.4.7-1ubuntu4 [87.7 kB]
Get:30 http://archive.ubuntu.com/ubuntu/ trusty/main libapache2-mod-php5 amd64 5.5.9+dfsg-1ubuntu4 [2210 kB]
Get:31 http://archive.ubuntu.com/ubuntu/ trusty/main php5 all 5.5.9+dfsg-1ubuntu4 [1302 B]
Get:32 http://archive.ubuntu.com/ubuntu/ trusty/main ssl-cert all 1.0.33 [16.6 kB]
Err http://archive.ubuntu.com/ubuntu/ trusty-security/main libxml2 amd64 2.9.1+dfsg1-3ubuntu4.1
  404  Not Found [IP: 91.189.91.15 80]
Err http://archive.ubuntu.com/ubuntu/ trusty-security/main openssl amd64 1.0.1f-1ubuntu2.1
  404  Not Found [IP: 91.189.91.15 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libx/libxml2/libxml2_2.9.1+dfsg1-3ubuntu4.1_amd64.deb  404  Not Found [IP: 91.189.91.15 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_1.0.1f-1ubuntu2.1_amd64.deb  404  Not Found [IP: 91.189.91.15 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Fetched 7633 kB in 33s (231 kB/s)
2014/06/10 18:45:41 The command [/bin/sh -c apt-get install -y php5] returned a non-zero code: 100
```