Security update

This releases updates and fixes the dependency of a third party library Guzzle 5 to Guzzle 6.
See DRUPAL-SA-CONTRIB-2017-008

• Add missing oauth_callback_confirmed parameter
• #1238752: Postgres compatability

See DRUPAL-SA-CONTRIB-2017-006

This includes an update to resolve an additional item from SA-CONTRIB-2017-005.

This mainly fixes a Security issue:

#2757739: Token value is not sanitized, when replaced from title field

Note that since this is an alpha release there is no corresponding Security Advisory issued by the Drupal Security Team - see https://www.drupal.org/security-advisory-policy for more information.

Security release, see https://www.drupal.org/node/2842759