add OpenGraph metadata

Conflicts:
	static/index.html
Add hint message to sidebar
centre legend headers
Pluralize detail level captions
Add framework for switching ballot types
add provincial properties to tilestache conf

Conflicts:
	conf/tilestache.cfg
implement ballot type switching

Conflicts:
	static/main.js
fix selection toggling on load
style tweaks
remove commented code
another style tweak
add abbr-tags in legend

Conflicts:
	static/index.html
update README

Conflicts:
	README.md
README tweak
more README
Add search feature
syntax error
rearrange sidebar
styling
re-add newlines