Un-skip and fix failing legend tests, fix failing label tests in FF.

Close #137.
Fix #524, crudely, by removing all tickLabels on each render.
Clean up code and remove some extra nested "g"s while at it.
Add unit test to catch this issue in the future.
Update quicktest.
Update built files.
Merge pull request #516 from palantir/fix-unit-tests

Un-skip and fix failing legend tests, fix failing label tests in FF.
Merge pull request #525 from palantir/fix-cat-axis

Fix #524, crudely, by removing all tickLabels on each render.
Merge branch 'master' into HEAD

Conflicts:
	plottable.js
	src/components/categoryAxis.ts