new: flexible background switcher

* xresources is now background capable;
* so as vimrc;
* so as i3;
_template.py: warning about autogeneration
mutt/solarized_light: fixing color
vimrc: ultisnips clearsnippets fix
vimrc: get rid of htmldjango
background: change $BACKGROUND in runtime
zshrc: S and S! aliases
xinitrc: GOPATH
xinitrc: BACKGROUND set properly
vimrc: remove delimitMate
vimrc: get rid of powerline
vimrc: get rid of syntastic
vimrc: background detection fix
breaking changes everyone!

Migrate to easier installation scheme, not based on Makefile.
dejavu: fixed bold arrows