Council Condidate card ui.

Issue: https://github.com/g0v/councilor-voter-guide/issues/31

Thank for
	@mirelle09 to give me idea
and
	@thewayiam to tell me the parameters about the data.

1.	Resetting bootstrap 2 grid from 1-10-1 to 10-offset1
2.	Use card ui to links (with district count and candidate count).
3.	Semantic doubling grid to links. (mobile-1, tablet-3, PC-5)
4.	Import some color class ready to use.