Fix missing ticks for bottom/right axis

The ticks were overlapping the axis line. Because both were 1px, the
ticks ended up being hidden.

This also flagged a case-sensitivity typo in the LightTheme.
Increase tickSize

Now that the ticks issue has been fixed, we adjust the tickSize to be
more visible.
Merge branch 'upstream' into feature/consistent-ticks
Update Changelog
Merge pull request #179 from tpkelly/feature/consistent-ticks

Fix missing ticks for bottom/right axis