cleanup in .vimrc
Merge branch 'master' of github.com:mdulghier/dotfiles

* 'master' of github.com:mdulghier/dotfiles:
  add ctrlp and vim-colorscheme plugins to vim, change vim theme to zenburn, set $TERM so vim themes work within tmux
  link .zshrc to home directory
  setup function for zsh, oh-my-zsh + small tweaks
merge