Set ruby omnicompletion variables
Add delimitMate plugin to autoclose everything
Convenient mappings to edit and source MYVIMRC
Fix rdebug abbreviation

Old one does not work because now it is included in Ruby 2.x
Add syntastic plugin

Passive mode by default because is a bit noisy with our project. Needs
some refinements for javascript files (not only html_tidy)
Add javascript-libraries-syntax