Ignore proper langpacks directory in Fireplace

gdit @cvan
make operator shelves have white background
add operator shelf logo (bug 917560)
Part of the way fixed with Travis

gdit cvan
Make tracking query strings configurable (bug 918241)
Merge pull request #265 from muffinresearch/make-query-string-tracking-optional

Make tracking query strings configurable (bug 918241)
Revert "Make tracking query strings configurable (bug 918241)"

This reverts commit 611ce1569422e6c0e4a3a2ab52212f7d4deb04c2.
Recognize new cancel code (bug 846818)

See: https://github.com/mozilla/webpay/commit/8b2e19963bff7bbe54d0f6e9a43348d60d7d11b5
prompt for login if receipt required for $0.00 apps (bug 917601)
add `cursor: pointer` to links without `href` attributes
Fixed some flaky tests
add region filtering to PotatoSearch™ (bug 917500)
add support for `privileged` `app_type` in PotatoSearch™
accept `src` from web activities (bug 918318)
append existing values for PotatoSearch™