Update all loggedInUser access to be dynamic (bug 1066511)

Don't modify the DOM for loggedInUser
Merge pull request #129 from muffinresearch/fix-loggedInUser-usage

Update all loggedInUser access to be dynamic (bug 1066511)
Use then to fix flakey tests
Merge pull request #131 from muffinresearch/fix-flakey-tests

Use then to fix flakey tests
Handle FxA oauth logins via redirects, not popup (bug 1054020)