Upgrade Vundle to NeoBundle

NeoBundle is similar to Vundle but better. See README for upgrade instructions.
vim-airline
disable gitgutter in writer.vim
reworked makefile. new targets: edit and update.
readme update
vim-less
release
fix depricated methods
Merge pull request #33 from astrails/neobundle_begin_end

fix depricated methods
Changelog
update to NeoBundle