Let violinplot work when bins have single observations
Merge pull request #264 from mwaskom/violin_single

Let violinplot work when bins have single observations
Fix typos
Omnibus doc updates
Merge pull request #265 from mwaskom/update_docs

Omnibus doc updates
Fix release note list
Fix calculation of PairGrid size
Fix case where PairGrid vars are passed in array
Merge pull request #268 from mwaskom/fix_pairgrid

Fix PairGrid
Add new lmplot and PairGrid examples
Better cubehelix example