switch from pathogen over to vundle

Letting vundle manage my plugin repositories is a *lot* easier, because
we don't have to muck about with submodules anymore.
clean up stuff I don't use anymore in vimrc
add ctrlp.vim.git
remove vim-matchit from repo
fix whitespace
add git info to bash prompt
use export for shell vars
fix: create vim/bundle dir properly in install script
use airline unicode like a real man
tweak git commandline display
add virtualenvwrapper support to bashrc
fix variable quoting
some refactoring git methods
uncommited changes in index now also show dirty status
no extra space in PS1 if not in git repo
revamp color handling to hopefully fix this terminal bullshit
virtualenv info in new terminal
set $ color based on return code
alias ack-grep only if it exists
add tmux configuration