optimize infinite scroll widget instantiation. don't instantiate timeago widgets for StreamElement and Comment widgets

Log out a user if they arrive at AuthorizationsController#new carrying the username of a different user

IZ MS fixed facebook inviter for people you are already friends with to use the normal aspect membership dropdown, and created some nuiaces in the seed script between bob, alice and eve and their fb status"

add a bunch of boilerplate js pages so the header works. would be great to get a baseclass, or some sort of 'run this on all pages' kinda thang

instantiate StreamElement widget after a post has been added to the stream by a user. time to clean publisher.js up. gross.

Also, for some reason, had to move the include of NotifierHelper to the view itself. That requires more investigation.

Conflicts:
	spec/javascripts/stream-spec.js