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) 
This is still "g.useruser" where it should be "g.user".