Feature/cas/speed editor

Fixed time picker race condition for grace period. Still quirky in that

in rounds down times from :01-:09 to :00 (and perhaps others). I think
that's a bug or setting in timepicker.

change over the 'get all discussion models' to use get_items() which is ...

change over the 'get all discussion models' to use get_items() which is better supported in Mongo-backed stores

	be picky about x as marker for correct requiring it to be first
non-whitespace char on line, followed by whitespace, followed eventually
but another non-whitespace char
 	strip trailing newline from selection.

add some simple in-mem caching for course TOC. This is a problem when ru...

in the model as well as the ancillary info

Bug 107: create update not working

add some simple in-mem caching for course TOC. This is a problem when running against Mongo since courses are created/disposed very frequently

Set up the framework for running lettuce tests against studio

Fix iframe conversion problem (111)

add required video setting