Updates for v.3

Added change log
merged capo v.3

Merge branch 'master' of https://github.com/tBaxter/capoConflicts:
	tango_capo/static/MANIFEST.in
	tango_capo/static/css/site.css
	tango_capo/static/css/themes/dark.css
	tango_capo/static/css/themes/light.css
	tango_capo/static/setup.py
	tango_capo/static/source/sass/layout_snippets/_horizontal_navigation.scss