Merge pull request #560 from AndreiH/issue_559

Adding condition to hover over the categories menu.
This will make FXA run faster on login
Uplift https://github.com/mozilla/marketplace-tests/commit/0f43b04cf47653a0dfa558fa8b1fa32cb514e058
Uplift https://github.com/mozilla/marketplace-tests/commit/a05eb6102b889f58614fa82eea1844cd337681bc
Fix mobile tests
Fix the mobile Android login, plus conditions were not ok
Adding sign in scenarios for FXA
Add click_sign_in() to test_that_reports_abuse_as_signed_in_user
Merge pull request #569 from AndreiH/abuse_as_signed_in_user

Add click_sign_in() to test_that_reports_abuse_as_signed_in_user
Fix login and uplift xfail
Merge pull request #570 from AndreiH/fix_login

Fix login and uplift xfail
Update FXA not to use page title to switch between windows
Merge pull request #571 from AndreiH/update_fxa_login

Update FXA not to use page title to switch between windows
Categories locators have changed
Merge pull request #572 from AndreiH/categories_loc

Categories locators have changed
Fix mobile categories locator
Merge pull request #573 from AndreiH/fix_mobile_cat_loc

Fix mobile categories locator
Update My Apps locator for mobile tests
Merge pull request #575 from AndreiH/my_apps_loc

Update My Apps locator for mobile tests
Fix assert for home_page. navigation tab, which is present in My Apps too