Remove the intro screen, that goes in the FTU
Merge pull request #29 from shane-tomlinson/remove-intro

Remove intro screen - it belongs in the FTE
Use the same logo in the FxA manager as the FTE.
Merge pull request #31 from shane-tomlinson/update-logo

Use the same logo in the FxA manager as the FTE.

@borjasalguero gave the in-channel r+. Merging. Thanks Borja!
Hook up the TOS/PP agreements.

* fxam_ui.js - Ensure transitions work for panels that do not have JS modules.
* fxam_navigation.js - Ensure initialization, back work for panels that do not have JS modules.
* Extract function refactorings in fxam_navigation.js & fxam_ui.js for readability
* In templates, convert h2 to h3 to go along with h3 CSS changes in #23
Hook up the Firefox Accounts intro screen in the FTE.
Merge branch '01-hookup-to-fte' into all-fxa-things
Merge branch '02-hookup-tos-pp' into all-fxa-things
Too many changes?

Contains:

- All panels changed by hashchange
- CSS back to being flexbox based
- only initialize panels / panel javascript once
- pub/sub for params shared between panels (Could use DOM listener
  instead)
- Navigation back to the panels

Broke:
- Not fixed next / prev enabled / disabled (should be handled within the
  panel)
- Some duplication / oddness left when changing to self contained
  panels.
replaced sub/sub with calling a refresh function