DOC: Fix typo in example
BUG: Use correct index
REF: Use model information in plot_fit
STY: Whitespace cleanup
REF: Save exog renames until one pass
REF: Standardize regression plotting a bit
REF: Rename plots from _ax and use _grid for clarity
ENH: Expose regression plots in api
ENH: Add influence plot
BUG: Don't invoke method on None
BUG: Fix missed refactor for patsy
BUG: Fix idx assumptions for utils graphics
ENH: Enhance the usage of plot_partregress and plot_partregress_grid
ENH: Make an annotate axes function
Add leverage_resid2 plot. Use annotate_axes function
BUG: Fix variable rename
ENH: Clean up CCPR plots
ENH: Clean up plot_regress_exog
ENH: Clean up plot_fit
STY: Capitalize title