Adding vim-abolish

After using Sublime Text for a while, I grew used to replacing words all
at once with regex and multiple cursors. I'm giving vim-abolish a try to
see how well it stacks up.
Add a few Vim plugins for faster development

* vim-indent-guide
Use vim as primary editor

Sublime Text 2 and 3 are awesome pieces of software, but I found the
workflow between editor and terminal a bit too tedious. I like having
everying in Vim and Tmux.
Store iTerm settings in dotfiles

Moving to a new machine (Mac) would be very tedous in re-setting up
iTerm settings. Make this a little more automated.