Add the ability to send emails to devs of paid apps (bug 896034)

That checked the `enable_new_regions` checkbox or not.
new reviewer tools nav between queue types (bug 839400)
Add additional settings to identitystage
Merge pull request #958 from davidbgk/896034-send-email-region-added

Add the ability to send emails to devs of paid apps (bug 896034)
hide Reviewers Tool pill nav if reviewer has only apps permission (bug 903072)
default to queue when toggling apps/themes tabs (bug 903124)
Remove NEWRELIC_INI from identitystage settings.
fix theme breadcrumbs
Allow API consumers to edit collections (bug 894585)
Allow API consumers to reorder applications in a collection (bug 894591)
DRF the global stats
Add NATIVE_BROWSERID_VERIFICATION_URL and NATIVE_BROWSERID_JS_URL to identitystage settings
Added HTML receipts (bug 890046)
Add a list_files command to webapps.
add reply tokens in reviewer emails (Bug 879535)
Fix waiting times in reviewers chart by using nomination date (bug 900897)
Fixing stats tests
L10N update for Czech (cs)
Check translations of email's subject/body when sending emails to dev about new regions (bug 902127)
Merge pull request #980 from JasnaPaka/master

L10N update for Czech (cs)