rails.md

[dennym]

Its kinda outdated, but something to start with. Had this copy still on my harddisk, its from http://www.addedbytes.com/cheat-sheets/ruby-on-rails-cheat-sheet/

[brennovich]

Wow, very cool :)

But there are few sections that are more Ruby concern than Rails, don't you think?

Suggestions:

1. Remove Regular Expression Syntax section, and move to their own cheat sheet;
2. Edit Reserved Words to list Rails' reserved words separated from Ruby's. Ex.: callbacks should be in Rails' list, unless in a Ruby's list;
3. Update Rails' folder structure to Rails 4.

Thanks for the contribution, @dennym!