Add pygments for code highlights.
Enable IndieAuth.

Also enables g+ badge that seemed to be missing in sidebar.

http://indiewebcamp.com/How_to_set_up_web_sign-in_on_your_own_domain

Conflicts:
	_includes/sidebar.html
Oops, ended up with TWO G+ badges. Reduced to one. Sorry all!
Merge remote-tracking branch 'pjf.github.io/base' into base