coded in colors vector

[adamkemberling]

Only change is that the input table now grabs colors from the color vector instead of the default values that were hard-coded in. I did not go through the full package build checks becauseI don't have the nfl package installed etc. But it seems pretty contained of a change.

[jthomasmock]

Thanks! I've refactored the function a bit for both square and pills and updated docs to reflect the changes along with a unit-test.