Modernize vim configuration + random updates.

Introduces neobundle.vim.
Also switching to using powerline in vim, tmux for niceness.

Also add git hook templates for auto-updating ctags.

Misc. changes to bash configuration too.
Add tmux-macosx-pasteboard as submodule.

Also cleanup gitmodules.
Set a large default history limit in tmux
Use tmux-pasteboard workaround
Add ackrc
Add ack settings for rake, haml, coffee
Alias for bundle exec
Use gitconfig's include feature

Also remove obsolete difftool reference
Add custom ack types for Rails projects
Add ft-ruby-syntax settings to vim
Set git's push style and mergetool
Let rbenv and rvm coexist
Load tmuxinator if available
Enable z if available

https://github.com/rupa/z "Jump Around"
Add powerline fonts as submodules
Merge branch 'rvm'