Initial implementation of MarginGrid
Rename MarginGrid to JointGrid
Cross-ref jointplot in regplot docstring
Add space option to JointGrid
Add jointplot function
Add jointplot and JointGrid to docs
Fix some formatting issues in the release notes
Make rugplot work directly with JointGrid
Fix JointGrid marginal density axes and kdeplot vertical fill
Merge pull request #130 from mwaskom/margin_grid

Add JointGrid and jointplot