Upgrade AHC 1.8.2, close #1631
Fix previous commit
Have a DSL for creating cookies, like the one for request bodies, close #1632
Fix test
Checks give a better error message
Merge pull request #1633 from nremond/err_msg

Checks give a better error message
Commit review, def-vs-val and Matcher should not be sealed for extensibility
Upgrade slf4j 1.7.6, close #1634
Already done in BaseActor
Complete the ScalaDoc for the conditionnal statements
Build a correct URI of the maven repo for the sbt , was broken on windows