First draft: lesson completion notification for coursera.
minor bug fix
Merge remote-tracking branch 'swirldev/parse_content' into coursera to enable
creation of test lesson with Type: Coursera attribute.
Test lesson for courseraCheck feature and bug fixes.
Merge branch 'master' into coursera
some small tweaks to coursera stuff
added yaml function call to imports
submit.url and challenge.url bugs fixed. Added check for email/password verification failure.
merge with master

Merge branch 'master' into coursera

Conflicts:
	DESCRIPTION
Merge branch 'master' into coursera
Merge branch 'master' into coursera
using yamlWriter; begin
Merge branch 'master' into courses
clean obsolete courses
Merge branch 'master' into courses
Allow autodetection of new variables to be set or unset in customTests.R
Changed test-play.R to test new omnitest. Now passes.
Removing coursera code which was accidentally included.
Removing references to RCurl and digest which were only needed for coursera code.
Moving AUTO_DETECT_NEWVAR flag to customTests environment where it can be set in a lesson's customTests.R. Default is still TRUE.