Update various vim plugins. Add vpaste. Change some vim bindings.

Delete ZenCoding, added Emmet. Update Syntastic. Remove vim-pastie,
add vpaste. Change vim bindings for column highlight to be nicer.
Remove a couple of superfluous ones.
Add vim-git. Remove "-master" from plugin names.
Add gundo.
Update tagbar.
Remove hardcoded path from tmux.conf (FINALLY).
Move powerline out in favor of airline. Add fugitive.

Move powerline to ~/.powerline, add airline for vim in its place,
add fugitive.