Remove 0.2 compatibility work arounds.
Define a Coord.subplot_grid. Prohibits some inconsistent use of subplots.
Fixes and improvements for subplot_grid with multiple layers. See #302
Add contour plotting from a matrix
Make `y` univariate function and `z` multivariate function/matrix aesthetic.
Remove broken check of kde function. Fixes #376.
Remove the other broken kde check.
Fix overeagerness to rotate labels. Fixes #335.
Remove require statements from src/Gadfly.jl
Merge pull request #385 from jiahao/patch-1

Remove require statements from src/Gadfly.jl
Merge remote-tracking branch 'src/master'