.vimrc: add neocomplete
.vimrc: add neco-ghc
.vimrc: add ghcmod-vim
.vimrc: map and hook some ghcmod features
.vimrc: bootstrap vundle
.zshrc: handle python2 or python3 virtualenv
.zshrc: remove obsolete virtualenv envvar

Remove VIRTUALENV_USE_DISTRIBUTE=1 envvar which is obsolete and a
noop in recent versions of virtualenv.  See pypa/virtualenv:2f1237a
for more info.
.vimrc: switch from vundle to neobundle.vim
.vimrc: automatically build vimproc shlib
.vimrc: fix GNU test used to decide make program