General patch release with dozens of bug fixes and more documentation improvements.

See the list below for more information on those changes and more.

Changelog

#814 Using JUnit rules to test exceptions (by @garcia-jj)
#816 Adding docs about Messages feature (by @garcia-jj)
#807 Support for download files as zip archive (by @garcia-jj)
#813 Adding JUnit rules to create temp dir (by @garcia-jj)
#809 trying to fix Travis instability (by @Turini)
#812 adding alternative for PrimitiveLongConverter and PrimitiveShortConverter (by @Turini)
#804 checking if result is used on DefaultLogicResult (by @Turini)
#806 Musicjungle production environment (by @Turini)
#801 updating versions after the release (by @Turini)
#800 checking included before including (by @Turini)

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