Update base.pp to point to new ZAP Download URL

As of Dec 2013, ZAProxy downloads have moved to SourceForge as noted here:

https://code.google.com/p/zaproxy/downloads/detail?name=README.txt&can=1&q=
Update base.pp to run apt-get update


Configured "apt-get update" to run before any packages were installed.   Without this, package installs were failing with multiple 404 errors:


==> attacker: Error: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install libcurl4-openssl-dev' returned 100: Reading package lists...
==> attacker: Building dependency tree...
==> attacker: Reading state information...
==> attacker: The following extra packages will be installed:
==> attacker:   comerr-dev krb5-multidev libcurl3 libgcrypt11-dev libgnutls-dev
==> attacker:   libgnutls-openssl27 libgnutlsxx27 libgpg-error-dev libgssrpc4 libidn11-dev
==> attacker:   libkadm5clnt-mit8 libkadm5srv-mit8 libkdb5-6 libkrb5-dev libldap2-dev
==> attacker:   libp11-kit-dev librtmp-dev libtasn1-3-dev pkg-config
==> attacker: Suggested packages:
==> attacker:   doc-base krb5-doc libcurl3-dbg libgcrypt11-doc gnutls-doc gnutls-bin
==> attacker:   krb5-user
==> attacker: The following NEW packages will be installed:
==> attacker:   comerr-dev krb5-multidev libcurl3 libcurl4-openssl-dev libgcrypt11-dev
==> attacker:   libgnutls-dev libgnutls-openssl27 libgnutlsxx27 libgpg-error-dev libgssrpc4
==> attacker:   libidn11-dev libkadm5clnt-mit8 libkadm5srv-mit8 libkdb5-6 libkrb5-dev
==> attacker:   libldap2-dev libp11-kit-dev librtmp-dev libtasn1-3-dev pkg-config
==> attacker: 0 upgraded, 20 newly installed, 0 to remove and 2 not upgraded.
==> attacker: Need to get 4292 kB of archives.
==> attacker: After this operation, 12.8 MB of additional disk space will be used.
==> attacker: Get:1 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main libgssrpc4 amd64 1.10+dfsg~beta1-2ubuntu0.3 [57.5 kB]
==> attacker: Get:2 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main libkadm5clnt-mit8 amd64 1.10+dfsg~beta1-2ubuntu0.3 [38.7 kB]
==> attacker: Get:3 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main libkdb5-6 amd64 1.10+dfsg~beta1-2ubuntu0.3 [37.5 kB]
==> attacker: Get:4 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main libkadm5srv-mit8 amd64 1.10+dfsg~beta1-2ubuntu0.3 [54.4 kB]
==> attacker: Get:5 http://us.archive.ubuntu.com/ubuntu/ precise/main libcurl3 amd64 7.22.0-3ubuntu4 [237 kB]
==> attacker: Err http://us.archive.ubuntu.com/ubuntu/ precise-updates/main libgnutls-openssl27 amd64 2.12.14-5ubuntu3.1
==> attacker:   404  Not Found [IP: 91.189.91.14 80]
==> attacker: Err http://us.archive.ubuntu.com/ubuntu/ precise-updates/main libgnutlsxx27 amd64 2.12.14-5ubuntu3.1
==> attacker:   404  Not Found [IP: 91.189.91.14 80]
Merge pull request #9 from mestizo/master

Update of OWASP ZAP and fix some first run problems