Bump version number.
Update changelog.
Update run model documentation.
Merge branch 'next'

* next:
  Update run model documentation.
  Update changelog.
Merge remote-tracking branch 'origin/master' into rails4

* origin/master:
  Update run model documentation.
  Update changelog.
  Bump version number.
Turn off whiney_nils config.

No longer supported in Rails 4.
Add eager_load configuration settings for each environment.