Fix fxpay API views, fix CORS (bug 1104371)

The missing serializer_class causes a 500 and
I'm not sure how long that has been broken.

http://sentry.dmz.phx1.mozilla.com/marketplace-payments-alt/payments-altallizomorg/group/21620/
Merge pull request #2754 from kumar303/api-fix

Fix fxpay API views, fix CORS (bug 1104371)
use memcache_url if specified (bug 1089848)
only get active price tiers in the transformer (bug 1089848)
Merge pull request #2756 from andymckay/1089848

use memcache in docker for zamboni
shut the hell up raven (bug 1028952)
Explicitly get the last record in failing test
add in some init api users (bug 1028952)
Merge pull request #2757 from andymckay/1028952

shut the hell up raven
allow redis to be overridden (bug 1106198)
only raise an error if there's more than host in locations (bug 1106198)
add in directories required by monitor (bug 1106198)
Merge pull request #2759 from andymckay/1106198

make monitor pass under docker (bug 1106198)
send email to reviewer list on all developer comments (bug 1101038)
Merge pull request #2758 from mstriemer/fix-bad-reviewers-test

Explicitly get the last record in failing test
Merge pull request #2761 from ngokevin/commdevmail

send email to reviewer list on all developer comments (bug 1101038)
add `link` tag for W3C-standardised manifest (bug 1084548)
Clean up access groups (bug 1025073)
Merge pull request #2764 from cvan/w3c-manifest

add `link` tag for W3C-standardised manifest (bug 1084548)
Add API to allow users to remove apps from their "My Apps" list (bug 1107511)