Fix the renderArea undefined bug
Merge branch '0.8.0' of github.com:palantir/plottable into grid-renderer
removing domain update methods from grid renderer now that that is handled by lazy autodomaining.
splitting out interpolated color scales to separate class to keep categorical scales separate.
Add more unit tests to scales.
Fix a bug uncovered where _autoDomain flag was inappropriately disabled by
other calls on the Scale, since they would call .domain(vals) which disabled
autoDomaining. Fixed this by having a _setDomain call which does not change the
_autoDomain flag.
adding unit test for grid renderer, making interpolated colorscale extend linearscale so its extents are computed properly.'
merge changes to scales.