Merge pull request #587 from AndreiH/master

Merge Fxa branch into master branch
Add test to login from My Apps on mobile
update method
Merge pull request #590 from AndreiH/mobile_my_apps_login

Add test to login from My Apps on mobile
Developer Hub Login locator needs to be changed
Merge pull request #592 from AndreiH/fix_login_locator

Developer Hub Login locator needs to be changed
Xfail submission of paid apps