session now stores all the new_app messages so that it can send them all in order to a new user to a session

Ignore-this: af340b055c427fc0fb6c5fdaea4042f6

darcs-hash:20130725161953-c21fe-1ae139a42792e5191a35850a67a05a18d0dfa745
reverted changes that added sent apps in memory

Ignore-this: 460463898166977cbf4dab3d02c38168

darcs-hash:20130726141442-c21fe-4d096031008a0d82dd63ebb22b22d9dd4e425bd9