PT-1491 - Updated build-petitions.make to use the latest petitions tag (7.x-3.0-alpha2), and updated drupal-org.make to use a specific revision of the services_documentation module.
PT-1488 - Added probes for receive new signatures per API key and per petition ID.

Updated monitoring and alerting documentation to include additional probes. Updated documentation's formatting.
PT-1491 - Removed outdated 'formatforlog' reference.
Pulling in updates from external petitions install profile repo.

	petitions subtree from git@github.com:WhiteHouse/petitions.git

Conflicts resolved:
	projects/petitions/build-petitions.make
	projects/petitions/drupal-org.make
	projects/petitions/modules/custom/petitions_api/signatures_queue/includes/receive_new_signatures.inc