[VAGRANT] Prevent `vagrant up` failures due to non-zero exits

Related: https://github.com/mitchellh/vagrant/issues/896
Changed the default `pid_path` attribute to "/usr/local/var/run"

On some system, contents of `/var/run` (and possibly `/usr/local/var/run`) is cleared on restart;
http://askubuntu.com/questions/89352/does-ubuntu-periodically-clean-empty-directories-under-var-run.

As discussed in #115 and #108, the solution is to simply ditch the `elasticsearch` prefix,
the PID files are based on node name anyway.

Closes cookbook-elasticsearch#108
Closes cookbook-elasticsearch#115
Updated the default Elasticsearch version to 0.90.10

See: http://www.elasticsearch.org/downloads/0-90-10/
README updates: Elasticsearch capitalization, `curl` command
Specify "ark" version dependency (0.2.4) in the metadata file

Related: 093f3de, 9b20d84

Closes #182
[DOC] Updated the instructions for EC2 in the README
[VAGRANT] Use `STDERR.puts` in Vagrantfile to prevent mangling redirected output
Use correct setting attribute for recovery throttling

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-indices.html

Closes #188
Pin the "yum" cookbook to the 2.4.4 version

Prevent `could not find recipe epel for cookbook yum` errors on Centos.

See: https://github.com/opscode-cookbooks/yum#notes
[VAGRANT] Install Java 7 for all defined VMs
[TEST] Fix test for the Nginx proxy failing on Elasticsearch 1.0
Added the `-d` switch to init script for Elasticsearch 1.x

Closes #185
[VAGRANT] Refactored the Chef installation shell provisioner in Vagrantfile
[VAGRANT] Remove VMs: precise32, lucid64, lucid32

Leaving only Ubuntu Precise and Centos 6
Use Ruby, not shell in `not_if` conditions.

Use Ruby builtins to check directories/symlinks.

The test command spawns a shell, which is slow
and it breaks my chefspec, because it requires to mock commands.

Closes #190
Updated Elasticsearch to 0.90.10 in "elasticsearch::deb"

Closes #191
Updated Elasticsearch to 0.90.12 in the "elasticsearch::deb" recipe
Updated Elasticsearch to 0.90.12 in the "elasticsearch::rpm" recipe
Updated the default Elasticsearch version to 0.90.12
Use correct URL for "IAM for instance" AWS documentation