[maven-release-plugin] prepare for next development iteration
Merge branch 'release/v1.2.0' into develop

merge the version back into develop
rectified build status and coverage status to develop
Fixed currently playing file and playlist operations when response is not valid because file is not playing or playlist is empty on the server
Changed release information
[maven-release-plugin] prepare release thedavidbox-client4j-1.2.1
Merge branch 'release/v1.2.1' (early part)

merge the version back into master but the tagged version instead of the release/v1.2.1 HEAD