Add "scorm" as composer keyword
Correct 'member' handling in Group
Turn off noise in test suite
Default ContextActivities properties to arrays

* The check to make sure the properties were set was not happening soon
  enough so that the set methods through the _listSetter were trying to
  push to arrays that were not defined yet
* Improve tests for fromJSON instantiation in ContextActivities
Merge pull request #12 from brianjmiller/master

Fixes for Group and ContextActivities