DOC:  Add contact.
API:  Save wage distributions as pdfs.
PEP8: Cleanup
ENH: New file for fig generation and changes to suppor that.
ENH:  More writing.  Going to merge GH changes.
Merge branch 'master' of https://github.com/TomAugspurger/dnwr-zlb

Bring's in changes made on GH at Morgan's.