Various refactoring:

- Added CentOS support.
- Added test-kitchen along with tests to validate all recipes for the default test-kitchen OS's: Ubuntu 12.04, Ubuntu 10.04, CentOS 5.9 and CentOS 6.4.
- Refactored database_mysql recipe to use database lwrp.
- Added ability to allow outside access to sonar db (in mysql) for tools like the sonar-maven-plugin.
- Minor changes to proxy_apache recipe to enable proxies.
- Add default Vagrantfile for quicker testing.
- Bumped version from 0.0.4 to 0.1.0.