Added more tests
Merge branch 'wikidao2' into wikidao
Fixed some code review issues and added support for WikiAttachmenthHandles
server side support of PLFM-1710 and PLFM-1707
added dowload wiki attachment file and preview to Synapse java client
Merge pull request #287 from john-hill/wikidao

fixes for PLFM-1710 and PLFM-1707