Fixes an issue where failed jobs re-run repeatedly
Check for MassAssignmentSecurity constant when deciding to set attr_accessible

ActiveRecord 4 *may* require setting attr_accessible if the 'protected_attributes' gem is installed. This changes checks for that case.
Update active_record.rb
Tests for protected_attributes and rails 4
Merge remote-tracking branch 'origin/pr/53'

Conflicts:
	lib/delayed/backend/active_record.rb
Prep for release 4.0.0.beta3
Add gem release tasks to rake
Adding support for the Teradata adapter, which needs the same behavior as the MSSQL adapter
Add missing require statement to load ActiveRecord generators
Merge remote-tracking branch 'origin/pr/67'
Prep for 4.0.0 release

[ci-skip]
Don't build against 1.8 anymore

[ci skip]
Change activerecord dependency to < 4.2
Merge pull request #86 from MSch/master

Bump activerecord dependency.
Prepare 4.0.1 release
Update mysql dependency to ~> 2.9
Add RuboCop
Fix RuboCop offenses
Enforce code coverage minimums
With the release of Rails 4, Rails 3.0 and 3.1 are no longer supported

See: http://weblog.rubyonrails.org/2013/2/24/maintenance-policy-for-ruby-on-rails/