Bug 1049916 - Create Firefox Accounts smoke tests to validate user authe...

...ntication R=spenrose
I see what you're saying in that for now these only serve as smoke tests, but I was thinking that eventually there are some things we'd want to test (like FMD), which would be better bundled with Settings app as an entry point, whereas for validating the RP API we'd still want to use the UITest app.   In other words, I was going to eventually add additional tests to each  of these in a suite grouping them together by whichever app we'd want to use as a starting point.  Does that make sense?