Decorated collection also responds to decorated_with?
decorated_with? is just instance_of?
Merge pull request #500 from drueck/collection-decorated-with

Decorated collection also responds to decorated_with?
Fix bad test
Avoid using extend in Decorator#==
Merge pull request #505 from haines/fix-extend

Avoid using extend in Decorator#==
Update CHANGELOG for 1.2.0.
bump version to 1.2.0
Pre-emptively deal with require issues.

Basically, when anyone else made a 'resource_override' generator,
it'd only require once. Because that's how require works. So let's make
sure that we require ours and nobody else's.

See https://github.com/rails-api/active_model_serializers/commit/2edaa22605af027c8efbac2040160fbfc93f5541