Adding tagbar, ultisnips to vim plugins

And updating vim-go
Updating name of gitconfig global ignore file
Updating gitconfig push tracking to simple (to match default behaviour)
Update colorcolumn to 120 characters and a less ugly color
Remove solarized from vimrc

Prefer molokai
Add vim-go key bindings

And UltiSnipsExpandTrigger
Clean up zshrc and moving some things to zshenv