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
Added the `maxBackupIndex` option to the default log appender

See http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/RollingFileAppender.html#maxBackupIndex

Closes #192
Fixed the "maxBackupIndex" support

* Renamed `maxbackupindex` to `max_backup_index`
* Fixed the ERb syntax to not mess up the YAML format and indentation
* Use the same "maxBackupIndex" also for slowlogs

Verified with Vagrant.

Related: #192
Allow any custom configuration
Bump version