PT-1346 Fixed AJAX error handling

	modified:   projects/petitions/modules/custom/wh_petitions/wh_petitions.module
	modified:   projects/petitions/themes/petitions44/css/style.css
	modified:   projects/petitions/themes/petitions44/sass/style.scss
	modified:   projects/petitionssignatureform/petitionssignatureform.module
PT-1346 Added a runtime check for config values before appending terms of service, etc.

	modified:   projects/petitions/modules/custom/wh_petitions/wh_petitions.module
PT-1346 - Implemented new configuration test in petitions signature form alter.
Updated profile version: 7.x-2.0-rc18: Simplified signing!

	modified:   build-petitions.make
PT-1325 - Removed wh_petitions dependency on petitionsignatureform.
petitions subtree from git@github.com:WhiteHouse/petitions.git
PT-1325 - Added petitionssignatureform to drupal-org.make.
PT-1325 - Added petitions-php-sdk to drupal-org.make.
PT-1325 - Incremented petitions profile tag.
PT-1325 - Added missing project type value to for petitionssignatureform.
PT-1325 - Removed revision specifications from drupal-org.make.
PT-1325 - Added missing type value to petitions project in build-petitions.make.
PT-1344 - Added isSignable property to petition object.

	modified:   modules/custom/petitions_api/signatures_queue/includes/receive_new_signatures.inc
	modified:   modules/custom/petitions_data/classes/Petition.inc
	modified:   modules/custom/petitions_data/classes/PetitionsSelectQueryMongo.inc
PT-1344 - Add is_signable param petitions API requests.

	modified:   modules/custom/petitions_api/api_petitions/api_petitions.module

PT-1344 - Updated isSignable check.

  This is not a property of a petitions object, it's just a check based on
  petition status.

	modified:   modules/custom/petitions_api/api_petitions/api_petitions.module
	modified:   modules/custom/petitions_data/classes/Petition.inc
PT-1344 Adding is_signable to query.
PT-1344 Adding isSignable to PetitionSelectQuery
pt-1344 Added logic to account for Responded status appearing in responseStatus, not status.

pt-1344 wh_petitions Defining signable statuses function.
pt-1344 petitions_data Altering check for isSignable to use Defined signable constants.
pt-1352 Adding isPublic=1 default to index query.
pt-1352 pt-1345 wh_petitions Added function to return array of statuses considered to be public.