Enable the "Create a password" title for transition_no_password

fixes #3355
Bold the main header on "yahoo makes this easy" and "email verified" screens.

fixes #3350
In the development menu, place showLoad above showWait.

This follows the z-index order and is easier to understand.
Fix the delay and error screen being displayed with white top and bottom margins if the loading screen is displayed.

fixes #3352
Change the "small" to "deemphasize" because @jedp is right, using small as a classname for a desktop only h2 is confusing.
Do NOT display the loading screen on desktop. People keep reporting it as jarring.
fixes #3354
Merge pull request #3358 from mozilla/styling_bag_of_goodies

Styling bag of goodies