Logout

(cherry picked from commit 358d1f892e9eeba9d3b405f6eadbc79b4de1b60d)

Conflicts:
	apps/system/js/fxa_manager.js
	test_apps/test-fxa-client/index.html
	test_apps/test-fxa-client/js/app.js
RP API bits

(cherry picked from commit 52ac54ce6ce2b724b4f42b41dd81fa6206acc65d)

Conflicts:
	apps/system/js/fxa_manager.js
Fix RP tests

(cherry picked from commit 72201b12995564aee6562eb28e5e6386924b2447)