Enable "points" mode in Axis.Category and add test that verifies range values in different range type.
Add update range after setting range type.

Close #919.
Merge branch 'develop' into enable_points_mode_category_axis

Conflicts:
	plottable-dev.d.ts
	plottable.d.ts
	plottable.js
	test/tests.js
Change test to check mark position instead of scale logic.
Change naming to be more accurate.
Merge pull request #1101 from palantir/enable_points_mode_category_axis

Enable points mode category axis