Support to notifications in every action. Adding 2 notification ways: email and messages.
Adding 3.5 format to workflow_forward template
Adding support to messages in workflow_backward action
Merge branch 'feature/ximdex-notifications' into develop
Adding path to session cookie
Fixing bug in channel selection in modify server action
Supporint several tabs in modify server action
Improve managemetadata: loading RNGs fields for ImageNode into the form
Merge branch 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'feature/ximdex-metadata' of github.com:XIMDEX/ximdex:
  Fixing some minor errors and performing in cascade the methods add and delete relations into the datamodel.
  New classes and table in the data model to manage metadata with Versions of the documents and not only idNodes.
  Improving manager class for metadata creation and deletion.
Merge branch 'develop' of github.com:XIMDEX/ximdex into feature/ximdex-metadata

* 'develop' of github.com:XIMDEX/ximdex:
  Supporint several tabs in modify server action
  Fixing bug in channel selection in modify server action
  Adding path to session cookie
  Adding support to messages in workflow_backward action
  Adding 3.5 format to workflow_forward template
  Support to notifications in every action. Adding 2 notification ways: email and messages.