refactor(test): Use a single function to create email addresses.

* TestHelpers->createEmail will create a restmail address
* Update ad-hoc email address creations to use this
* Add TestHelpers->emailToUser to get the user from the email address.

fixes #1050
fix(client): Do not show Fx for Android marketing material if completing sign up on B2G or Fennec.

issue #1041
Merge pull request #1051 from mozilla/issue-1050-generic-email-create

refactor(test): Use a single function to create email addresses.
test(intern): Update Intern to 1.7.0
Merge pull request #1061 from vladikoff/int170

test(intern): Update Intern to 1.7.0
fix(l10n): normalize locale when fetching client.json

Fixes #1024.
Merge pull request #1052 from mozilla/issue-1041-no-marketing-mobile-firefox

fix(client): Do not show Fx for Android marketing material if completing sign up on B2G or Fennec.
Merge pull request #1063 from mozilla/issue-1024-normalize-locale

fix(l10n): normalize locale when fetching client.json
refactor(view): use shortened url for Android marketing banner

Fixes #1036.
Merge pull request #1064 from mozilla/issue-1036-android-marketing-url

refactor(view): use shortened url for Android marketing banner
Release v0.12.0
feature(client): Send password reset email from /signin if user has filled out a valid, known email.

fixes #762
cleanup(client): Use generic FormView.allowOnlyOneSubmit functionality in force_auth.js->resetPasswordNow.