vimrc: Added shortcut for Gdiff
global gitignore: added excludes for ctags files
vim: Added ruby-debugger and AnsiEsc plugins
vimrc: Updated for ruby debugger
Tidy-up bashrc and profile
vimrc: Multiple updates and adidtions

* Ruby improvments
* New leader mappings
* Searching improvements
Script for creating CTAGS for rubies and gems

The script creates CTAGS for the current RVM ruby and gemset.
vimrc: Ruby debugging shortcuts

Mapped some F-keys to make ruby debugging easier.