Skeleton files for a quick exercise demo
Add start and stop functionality
Track time in instructor
Fix plugin order

This is right now far too important.
The fillInTheBlank plugin needs the morphology loaded to start working.

As the morph plugin is not firing an event, we need to guarantee this
through load order right now.
Create simple exercise for verbs in fITB plugin
Add fillInTheBlankForm directive
Use new directive in plugin and show hints
Start validation of answers
Output some validations
Minor fixes in instructor
Fixing the math a little...