Incorrect NULL value check fixed in PP cron.
Remove ability to set rubric if Grademark is not enabled in PP
Remove grademark options from Turnitin Assignment settings if it is not enabled.
Fix file errors page error caused by file absence. (thanks to Ruslan Kabalin)
Course migration bug no longer tries to populate PP array in migration if PP not installed
Apostrophe error fixed for module description
Course migration error fixed when no Turnitin courses exist
Inbox links fixed after refreshing non moodle users submissions in Turnitin Assignment
Extra 'nm-' for non moodle user inbox links removed.
Non moodle user ids substituted for 0 with launchers
cron now looking for numeric grade instead of null value
Merge branch 'develop' into feature/2014012407

* develop:
  Issue #67 fix issue with date handling.
  Issue #55 check anonymous marking is enabled.
Unnecessary reseting of variable removed
Docs and version numbers updated
Merge branch 'feature/2014012407' into develop