REGISTRAR: added support for tags with links using google authz

- Added tags: {perunGuiUrlGoogle}, {validationLinkGoogle},
  {invitationLinkGoogle} and {appDetailUrlGoogle}.
- Updated javadoc.
Merge pull request #443 from zlamalp/google

REGISTRAR: added support for tags with links using google authz
Fix error message

Message was broked in bd37b8bb60a2dd8c1acd183d40aa73d82096983d
Fix of typo in attributesManagerImpl

 - display name for attribute synchronizationTimestamp and
   synchronizationState
Merge pull request #445 from stavamichal/typoFixInAttributesManagerImpl

Fix of typo in attributesManagerImpl