#603 translate clip region to pad all sides evenly
#603 unit test translate clip region to pad all sides evenly
Merge pull request #717

Conflicts:
	src/coordinate-grid-mixin.js
improve doc
add clipPadding to various examples to make them look better
update stock fixture with new clip region
use matchers to skirt IE idiosyncracies
Merge pull request #715
Merge branch 'master' of github.com:dc-js/dc.js into inovance