Fix request body and response documentation being the same

Add some tests for generation of request bodies and improve the
tests for responses.

Tidy up some unused imports.

!BUG:MUSAPI-89
!TEST:
Look at generated REST documentation and see that the examples for
request bodies and responses are no longer identical. A simple
example is AlbumController PUT /albums/{albumId} where the request
should only contain id fields for artist, genre, contentManager
and image unlike the response.
Review fixes

!IGNORE
Merge pull request #17 from brucegodden/MUSAPI-89

Fix request body and response documentation being the same
Update the version number

The old version 25 jar seems to hae been uploaded to artifactory in
the wrong place so it has never been usable. So change the version
number to 26 to make sure we are picking up the new version.

!IGNORE
Merge pull request #18 from brucegodden/MUSAPI-89

Update the version number
Update the version number again and build a pom.xml containing dependencies

!IGNORE
Merge pull request #19 from brucegodden/MUSAPI-89

Update the version number again and build a pom.xml containing dependencies