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 pull request #90 from seankross/master

added multi-course installation for dropbox and google drive
updated DESCRIPTION date pre-release
Fixed unit test.
Merge branch 'master' into coursera
reverted code in test-all.R to comply with new testthat recs and made tests pass
using yamlWriter; begin
fixed test thanks to bill
Merge branch 'master' into courses
clean obsolete courses
Cosmetic fix.