added backups to vim
Merge branch 'master' of github.com:jimmydburr/dotfiles

* 'master' of github.com:jimmydburr/dotfiles:
  vimrc tweaks
  nerdtree fixes
  added composer
  mods to vimrc for leader c
  add ctrl n as nerdtree
  added nerdtree. removed a few other bundles
  git completion and linux difftool meld
  added composer and tweaked vimrc to put mytodo in btshare and custom linux fonts