GovCloud migration

[jseppi]

This PR makes necessary code changes for migrating Checklistomania from the E/W-cloud.gov platform to the GovCloud-cloud.gov platform.

[coveralls]

Coverage increased (+0.7%) to 96.456% when pulling aa6b059 on govcloud-migration into 6c9ee2d on master.

[coveralls]

Coverage increased (+0.7%) to 96.491% when pulling 793ef3e on govcloud-migration into 6c9ee2d on master.

[coveralls]

Coverage increased (+0.5%) to 96.241% when pulling dcaac5f on govcloud-migration into 6c9ee2d on master.

[coveralls]

Coverage increased (+0.5%) to 96.241% when pulling 2f19fd4 on govcloud-migration into 6c9ee2d on master.

[jseppi]

This looks great, @yozlet! Thanks for finishing up the migration.
The migration notes are great as well - thanks for writing those up!

[jcscottiii]

nice!!