[vim] Add the vim-multiple-cursors bundle.

This allows for multiple cursors in vim.

See https://github.com/terryma/vim-multiple-cursors
[git] New sets of aliases and configuration
[vim] Update neocomplcache.
[vim] Additional configuration for certain file types.
[vim] Add support for git-gutter.
[vim] Adding vim-gitgutter.
[vim] Tweak neocomplcache, and disable showing by default.

This plugin ends up causing some issues here and there, so just don't
enable it by default.
[vim] Add the Unite vim bundle.

This provides Control-P-like functionality, MRU lists, and buffer
management.
[vim] Add the dash.vim plugin module.

This allows looking up docs through Dash.
[zsh] Bind Control-R to search backwards in history.
[zsh] Update the path for rvm and refactory.