Fix bash-it prompt

* Overriding PROMPT_COMMAND kills the bash it theme system
* So stop doing that
Merge pull request #177 from ohrite/bash_it_prompt_fix

Fix bash-it prompt
Simplification and changes to be able to install bash-it globally
Allow a custom fork of bash-it

Since the bash-it maintainer isn't very fast in approving theme pull requests, i needed my fork and not the main bash-it repository. So i moved the repo url to the attributes file
This version limitation is more a hassle than a benefit, but this might be personal preference
Update recipes/textmate2.rb

1/3/2013 version of TextMate 2
Merge pull request #180 from acgetchell/patch-1

Update recipes/textmate2.rb
Re-enable version limitation
updated vim-hash to pull in new location for vim-slim
Merge pull request #179 from roderik/improvement/bash-it

Globally installed bash-it
refactor vim recipe