Adding additional entity hooks.

- Adds `afterNodeCreate`, `afterTermCreate`, and `afterUserCreate`
  events.
Issue #2145639 by mongolito404: Behat exits without producing any output when using the 'drupal' api driver without a configured database.
Upgraded Behat to 2.5.*@stable.
Merge pull request #21 from cpliakas/behat-upgrade

Upgrade Behat to 2.5.*@stable
Follow-up to commit 47fa98b to fix afterNodeCreate hooks.
Added support and step definitions for Drupal warning messages.
Merge pull request #22 from algorgeous/master

Added support and step definitions for Drupal warning messages.
Merge remote-tracking branch 'o/master' into d7-fixes