upgrade d3 to v3 and fix some broken test cases
upgrade d3 from v2 to v3
fix pie chart test cases
[#106] upgrade d3 to v3
Merge branch 'master' of github.com:NickQiZhu/dc.js

Conflicts:
	dc.min.js
Merge branch 'master' of github.com:NickQiZhu/dc.js

Conflicts:
	dc.min.js