1) a set_grid function
2) a general purpose set_rcparams() function
=> both are added to the top readme example
3) a linewidth arg to set_spines()
4) a color arg to set_pips()
5) a helper.py module with a function get_rcParams_containing() to search rcParams keys by substrings to aid theme building.
6) Themes: fivethirtyeight-grey, fivethirtyeight-white, financial-times-light, dark and barcanumbers-lightgrey.
This PR adds
1) a set_grid function 2) a general purpose set_rcparams() function
=> both are added to the top readme example
3) a linewidth arg to set_spines() 4) a color arg to set_pips() 5) a helper.py module with a function get_rcParams_containing() to search rcParams keys by substrings to aid theme building. 6) Themes: fivethirtyeight-grey, fivethirtyeight-white, financial-times-light, dark and barcanumbers-lightgrey.