Bug 1073348 [PulseGuardian] "Fake account" mode for local development - https://bugzilla.mozilla.org/show_bug.cgi?id=1073348

General outline of work done:

* added cli function to deal with command line arguments and do some setup
* fake_account global variable to track use of fake fake account
* load_fake_account function to setup fake account information (session, etc...)
* checking when no user session is available if fake account was enable and loading that information
* disabling fetching of persona js on fake account (it kept reloading the page because our account is, indeed, fake) 
I think a couple more details are warranted here, probably a separate paragraph below, just to explain what "fake account" means exactly (bypasses Persona for testing, creates given user if necessary, and logs you in automatically).  And please keep the file to 80 chars wide.