LDEV-2140 Made it so that tool activities outputs are retrieved once on single click the first time they are clicked, instead of when they are dropped from the toolkit. Also got it working so that when you open an existing design with outputs, it selects the correct one in the gradebook output combo box.
LDEV-2177 Fixed IE using cached version of workspace tree by making each request unique by appending the current time in milliseconds to the request that gets the folder's contents