PT-1089 Quick CSS color change to service documentation table of contents
PT-1037 - Only report zero emails sent if debugging is on.

	modified:   modules/custom/signatures_queue/includes/initiate_signature_validation.inc
PT-961 Updating UPDATE.txt and INSTALL.md.
PT-961 Updating services_documentation in make file.
PT-961 Using git to dl services_documentation in make file.
PT-1100 - Fixed PHP notices.
PT-1100 - Added patch to make file to fix services WSOD when missing required argument.
PT-961 Updating api_validations
PT-1100 - Added 5xx status code support to api_errors_throw_error().
PT-1100 - Fixed shunt_api returning HTML 404 page on shunt trip.
PT-961 Removing documentation versions from services_documentation implementations
PT-961 Significant updates to signature queue processing.
PT-961 Removing documentation versions from services_documentation implementations
PT-1067  Empty queue check.
PT-961 Removing api_validations/api_validations.inc.
PT-1065 Updating petitions_maintenance.install update hook.
PT-1065 Updating petitions build file.
PT-964 - Added the api_key_manager module
PT-1057 - Added petitions cache invalidation.
Merge pull request #34 from WhiteHouse/pt-1057-invalidate-petition-cache

PT-1057 - Invalidate cached petition. Drush script for easier testing.