Best Fit Lines about yellowbrick

[rebeccabilbro]

Seaborn has linear regression model plotting: https://stanford.edu/~mwaskom/software/seaborn/tutorial/regression.html

[rebeccabilbro]

Other line-of-best-fit methods with matplotlib:

• http://matthiaseisen.com/pp/patterns/p0170/
• http://stackoverflow.com/questions/22239691/code-for-line-of-best-fit-of-a-scatter-plot-in-python
• http://stackoverflow.com/questions/19068862/how-to-overplot-a-line-on-a-scatter-plot-in-python

[dot2dotseurat]

I will give this one a shot. -Meghan

[rebeccabilbro]

Thanks to @naturallogofx for the preliminary implementation of the linear best fit lines! Next steps are to put all of them into the API format and develop similar implementations for quadratic and exponential curves (issue #30). I'm thinking we should create a bestfit.py with a BestFit base object and then have LinearBestFit, QuadraticBestFit, ExponentialBestFit classes.