Merge pull request #3 from felixgirault/master

ensure up to date after changes merged into main project
Make sure html variable always available
cleanup
Cleanup OG provider and created Prezi OG provider
Cleaned up array duplication and html function

Made the insert html function more robust to handle inserting html
variable better and smarter.
Fixed up the tests

hopefully got this right this time :)
Merge pull request #23 from laughingwithu/master

html variable set in most cases and prezi provider