OO-2732: implement a matchInteraction with drag and drop (fallback to click possible) with slightly enhanced editor and word export

OO-2708: update qtiworks to 1.0.3, add validation to FIB and hottext editors, fix an issue where a gap text alone in a paragraph is deleted by TinyMCE

OO-2602: skip close step if there are no review and no feedbacks, implement some selenium tests to secure the different flows for different settings

OO-2430: update paypal libraries, fix configuration trailing tab, fix return from paypal, fix transaction sort by date and status in administration, fix missing icon...

OO-2429: move the foreign key from identity to user, remove double mapping of identity, add more unit tests for invitation, unify the methods to create the user and identity

OO-2354: decouple attribute sued to search a user on the LDAP server from the user identifier and make it configurable, add embbeded LDAP server for unit tests

OO-2041: upgrade hibernate and infinispan, update mapping to use TableGenerator with legacy-hilo optimizer

OO-1867: upgrade selenium and arquillian libraries to support Firefox 46 and update the tests to work with them

OO-1770: remove the maven repository of codehaus, more unit tests for forum, hardened the closing of the info blue box, fix an issue with the blue box, fix an issue with AssessmentTest.bulkAssessment on PostgreSQL