Generic clients

[benblack86]

Added back information on generic clients. I'm trying to learn more about higher kinded types so this now makes sense! Whilst I was there, I changed a few flatMaps tomaps since nothing needed to be flatted.

[codecov-io]

Codecov Report

Merging #535 into master will increase coverage by 4.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
+ Coverage   80.62%   84.74%   +4.11%     
==========================================
  Files         117       98      -19     
  Lines        4512     4293     -219     
  Branches      359      357       -2     
==========================================
  Hits         3638     3638              
+ Misses        874      655     -219

Impacted Files	Coverage Δ
...olossus-docs/src/main/scala/RedisRetryClient.scala
colossus-docs/src/main/scala/HttpService.scala
colossus-docs/src/main/scala/Fibonacci.scala
...lossus-docs/src/main/scala/MetricTickExample.scala
colossus-docs/src/main/scala/Metrics.scala
colossus-docs/src/main/scala/FutureClient.scala
colossus-docs/src/main/scala/HttpService2.scala
colossus-docs/src/main/scala/Fibonacci2.scala
colossus-docs/src/main/scala/RedisClient.scala
colossus-docs/src/main/scala/Fibonacci3.scala
... and 7 more

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[benblack86]

Added codecov.yml

[benblack86]

Also bumping SBT version since the previous version was causing problems with IntelliJ.