Removed .sql files from global gitignore
Ruby support

- Prfixed homebrew's ruby bin path to PATH.
- Edited vimrc so that <F5> will run ruby files.
Added vim plugins as submodules:

- vim-ruby
- simpledb
Added pgSQL syntax plugin for vim
All vim plugins are now submodules
.gitmodules: ignore dirty submodules

This ignores any untracked files in the submodule directories.
vim-pathogen is now a submodule

Just like the others...