[vim] Removed indexer bundle

I wasn't using it, and it was causing errors with a rails.vim/vimprj interaction.
[vim] Moved peepopen plugin to the bundle dir
[vim] Removed obnoxious local_color_scheme plugin
[vim] Added rails.vim and some useful helper plugins
[vim] Added vividchalk colorscheme

This seems to work especially well in rails
[vim] Misc useful commands

- %% expands to the current dir within a command
- \\ edits the alternate file