civicrm-47: CiviCRM 4.7.31 release

civicrm.php

civicrm/CONTRIBUTORS.txt

civicrm/CRM/ACL/DAO/ACL.php

civicrm/CRM/ACL/DAO/Cache.php

civicrm/CRM/ACL/DAO/EntityRole.php

civicrm/CRM/Activity/BAO/Activity.php

civicrm/CRM/Activity/DAO/Activity.php

civicrm/CRM/Activity/DAO/ActivityContact.php

civicrm/CRM/Activity/Import/Form/MapField.php

civicrm/CRM/Activity/StateMachine/Search.php

civicrm/CRM/Activity/Task.php

civicrm/CRM/Admin/Form/PaymentProcessor.php

civicrm/CRM/Admin/Form/Setting/Smtp.php

civicrm/CRM/Admin/Page/AJAX.php

civicrm/CRM/Batch/BAO/Batch.php

civicrm/CRM/Batch/DAO/Batch.php

civicrm/CRM/Batch/DAO/EntityBatch.php

civicrm/CRM/Batch/Form/Entry.php

civicrm/CRM/Campaign/DAO/Campaign.php

civicrm/CRM/Campaign/DAO/CampaignGroup.php