Reorganize to support more than just football

[bsmiller25]

Summary:

• Move football to own submodule
• Create basketball submodule

Known issues:

• utils.py could probably live a level higher and be shared instead of duplicated across football and basketball
• README out of date
• my suggested documentation for usage would be avoiding namespace issues is:

import espn_api.football as football  
league = football.league(...)

and

import espn_api.basketball as bball
league = bball.league(...)

• There are a lot of basketball stats in constant.py and I couldn't figure them all out.
• I've only written this based on my head to head categories league. Probably need to change a bit to handle different scoring formats.
• Overall, basketball has much less functionality than football but I think this is a decent start!

[bsmiller25]

I also recommend renaming this repo from ff-espn-api to espn-api or something without ff in it

[codecov-io]

Codecov Report

Merging #73 into develop will decrease coverage by 23.17%.
The diff coverage is 24.59%.

@@             Coverage Diff              @@
##           develop      #73       +/-   ##
============================================
- Coverage    98.96%   75.79%   -23.18%     
============================================
  Files           13       21        +8     
  Lines          578      822      +244     
============================================
+ Hits           572      623       +51     
- Misses           6      199      +193

Impacted Files	Coverage Δ
espn_api/football/utils.py	100% <ø> (ø)
espn_api/football/constant.py	100% <ø> (ø)
espn_api/football/settings.py	100% <ø> (ø)
espn_api/football/player.py	100% <ø> (ø)
espn_api/football/activity.py	100% <ø> (ø)
espn_api/football/pick.py	100% <ø> (ø)
espn_api/football/__init__.py	100% <ø> (ø)
espn_api/football/box_score.py	100% <ø> (ø)
espn_api/basketball/logger.py	25% <ø> (ø)
espn_api/football/matchup.py	100% <ø> (ø)
... and 20 more

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