New algorithm to calculate popularity
Merge branch 'master' of https://github.com/ging/vish
Change XSD file
Now multiple-choice, sorting and short answer quizzes validate in http://validator.imsglobal.org/qti/index.jsp?validate=cartridge . True-false quizzes testing
Merge branch 'master' of github.com:ging/vish
Some bugs fixed to validate SCORM manifest and LOM metadata
refresh clear overrides
Merge branch 'master' of github.com:ging/vish into vish-b3