Verify inapp id in receipts (bug 1021359)

- Add inapp_id to inapp product receipt
- Update receipt generation tests
- Verify inapp_id against contribution during receipt verification
- Update receipt verification tests
Merge pull request #2190 from JaredKerim-Mozilla/1021359

    Verify inapp id in receipts (bug 1021359)
Updated purchase tests to not reference addons
Fixed developers tests
Update test after fixture change
Put a couple things back after over-aggresive deletion
remove all unused LESS files and condense legacy Marketplace Admin CSS (bug 842352)
Another test fix after fixture change
Fixed mkt/comm/ tests
Merge pull request #2193 from cvan/less-less

remove all unused LESS files and condense legacy Marketplace Admin CSS (bug 842352)
ensure urls are created correctly (bug 1021991)
Merge pull request #2199 from andymckay/1021991-fix-url

ensure urls are created correctly (bug 1021991)
run zamboni on 2600 by default (bug 1021991)