fix excluding of current mug type from question type changer
add vellum namespace by default
show current question type name in dropdown button
fix issue with mug.parentMug
change behavior of 'return_all' plugin methods

don't include undefined values for plugins that don't define that method
extract assertXmlEqual test utility
add components from HQ as test dependencies
minor syntax change
minor changes to make windowManager more generic
remove dummy tests
make tests actually run vellum
add jquery.simulate
prettyPrint -> getStructure
add ability to lock questions

- plugin that locks questions based on vellum:lock attribute
- functionality in UI and core for disabling certain changes to locked
  questions
- tests, some of which don't simulate the UI correctly yet
add note about tests to README
Merge pull request #68 from mwhite/locked

add question locking