Run the validator task as a post request task
Removed Python 2.7 tests to see if it helps Travis.

We're thinking it won't but it's simple enough to try.
Merge pull request #2768 from mstriemer/validator-post-request-task

Run the validator task as a post request task
Allow OPTIONS req to receipt verifier -bug 1108817
Start fetch_manifest task after request completes
Merge pull request #2770 from kumar303/options

Allow OPTIONS req to receipt verifier -bug 1108817
Merge pull request #2771 from mstriemer/fetch-manifest-post-request-task

Start fetch_manifest task after request completes
Remove coverage to test any speed differences
Fixed travis script. Oops.