Refactor recipes

Cleaned up the `default` recipe.

* extracted platform specific fixes
* extracted 3 ways to install ruby:
  * via package (ruby1.9.3-p0 on Ubuntu 12.04)
  * via ruby-build (ruby1.9.3-p429 on all platforms)
  * via rvm (ruby1.9.3-p429 on all platforms)
* extracted `nginx` recipe so people can opt-out and use apache. 

All development specific fixes have also been removed and will be added to a `development` recipe.