Remove deprecated vim powerline

Conflicts:
	vim/bundle/powerline
Remove deprecated vim powerline
Remove tComment, add new powerline
Change colour of right side host prompt
Adds vim-multiple-cursors
Add chruby support

Needs a bit more work to get it fully working as rbenv trumps it at the
current time.
Tmux copy/paste improvements

This might help. Not sure how useful this is though.
Add track-feature alias to gitconfig
Add zsh prompt support for vi mode

Very basic support. Not fully working yet.