vim: replace many-colorscheme-bundle with xoria256-only-bundle
vim: add words to spellfile
Revert "Enable cursorcolumn in vim"

This reverts commit 93be928563ff265890ccb315303eea72be0c13cb.
vim: show italic comments in gvim

Local xoria256 modifications have to be executed after colorscheme was loaded.
Otherwise the custom changes won't take effect.
vim: install 'signify' bundle
vim: use 'bubblegum' theme for airline

The 'bubblegum' colorscheme is based on xoria256, so the airline colors will
match with the vim colorscheme.
vim: add words to spellfile