Added rvm dotfiles for ruby versioning and gemset

Hey Nicolas!
  I added these two files for RVM, (ruby version manager). Assuming you have RVM installed, when you cd into the project directory it will create a gemset path for that project where all of your local gems (versioned) will be stored.  This allows you to separate the versions of gems your using for different projects.  See here:

http://rvm.io/

  Going to send other feedback in an email, nice work!

- Matt