Add ability to retrieve basic matchup scores for a season

[jamesshaw1987]

Would like to have changed the Boxscore class to extend the MatchupScore class, but not sure it would improve readability or reduce duplication, so left it alone.

Integration tests are currently failing as the snapshot in the repo is out of date. Not certain what needs doing to update the snapshot.

[jamesshaw1987]

Integration tests are currently failing as the snapshot in the repo is out of date.

Doesn't look like this is the reason for failing actually. All the tests that use the seasonId parameter are failing with a 400 response.

Edit: Or maybe it's just because I wasn't setting the leagueId and authentication cookies when running the tests...

[jamesshaw1987]

Also added in the ability to fetch basic team data for a season, without including roster data.

[jamesshaw1987]

These Code Climate failures are very annoying. At some point some level of duplication is fine! Any suggestions on what else to do to get it to accept the code?

[codecov-commenter]

Codecov Report

Merging #157 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #157   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        14    +1     
  Lines          181       203   +22     
  Branches        25        28    +3     
=========================================
+ Hits           181       203   +22     

Impacted Files	Coverage Δ
src/client/client.js	100.00% <100.00%> (ø)
src/matchup-score/matchup-score.js	100.00% <100.00%> (ø)

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