Fixed similarity / grademark sorting
Fix for Turnitin Assignment inbox so it can now be sorted by similarity score and grade
Performance logging of curl calls (provided by Androgogic).
Global tiipp variable added so Androgogic offline mode doesn't crash moodle assignment.
Hard errors changed to soft errors when the cron is run.
Remove submissions after 5 submission attempts if assignment exists in Turnitin.
Fix for incorrect assignment id search when refreshing rubrics in PP.
Unused function check_user_class_membership removed from turnitintooltwo_user.class.php
Remove duplicate refresh row call by only binding one event and delete row and re-add when row is refreshed for correct sorting
Docs & version numbers incremented.
Open DV in Firefox in a frame instead of iframe to fix resizing and non-downloadable file bugs.
Open DV from PP in Firefox in a frame instead of iframe to fix resizing and non-downloadable file bugs.
Merge branch 'develop' of https://github.com/jmcgettrick/MoodleDirectV2 into develop

# By David Dyke
# Via David Dyke (1) and John McGettrick (1)
* 'develop' of https://github.com/jmcgettrick/MoodleDirectV2:
  Fixed similarity / grademark sorting