Make font fallback work better
Fix subplot creation on older matplotlibs
Merge pull request #176 from mwaskom/linux_fonts

Make font fallback work better
Initial PairGrid implementation
Preliminary hue grouping in PairGrid
Only make diag axes if needed
Some PairGrid tests
Add palette flexibility and tests
Factor grid figure palette creation into base class
Some more housekeeping to get legends working
Add PairGrid and pairplot to axisgrid docs
Add basic pairplot function