Move palette functions into own module and add tests
Make color_palette return a context manager and deprecate context_palette
Add axes_style and set_style, with tests
Refactor and update rc parameter control
Update and fix style function docstrings
Update example scripts
Update example notebooks
Update docs with new style information
Abstract out definitions of gray in the styles.
Py3K fixes
Color axes text with dark gray
Fix violinplot example
Merge pull request #141 from mwaskom/style_overhaul

Overhaul style functions