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
Fix typo in `guide.jl`
Remove `prepare_display` from docs
Add more documentation

- Geom.contour
- Guide.colorkey
- Guide.title
- Guide.xlabel
- Guide.ylabel
- Guide.xticks
- Guide.yticks
Fix incorrect ordering is discrete color keys.
Add preserve_order arg to discrete_color_hue.
Merge pull request #387 from darwindarak/guide_jl_typo

Fix typo in `guide.jl`
Fix disabled clipping and subplot layout issues. Fixes #383.
rough first pass at Stat.qq

Just calls qqbuild() on aes.x and aes.y, and writes the .qx and .qy
to aes.x and aes.y.
[WIP] extend Stat.qq to work with Distribution and add tests

Requires modifying some basic definitions (types that are allowed to
be bound to aesthetics, and skipping scale application on the first
pass).

Needs more work on non-default Scale application
scales work for Distributions now, too (with tests)
document Stat.qq
Merge branch 'add_docs' of https://github.com/darwindarak/Gadfly.jl into darwindarak-add_docs
Website things.