Delegating a bunch of methods to #decorated_collection.
Delegating a bunch of methods to #decorated_collection.

Fixes #187.

This is cleaner than the last two implementations. I'm not convinced
that it's perfect, but it seems pretty good.

drapergem/draper,chuck-john/draper,donaldpiret/draper,jianyuan/draper,turingschool/draper,outstand/draper,yui-knk/draper,drapergem/draper,Bastes/draper,outstand/draper,liwangbest/draper,mallikarjunayaddala/draper,estum/draper,drapergem/draper,turingschool/draper,liwangbest/draper,chuck-john/draper,mallikarjunayaddala/draper,totzyuta/draper,estum/draper,krainboltgreene/draper,jianyuan/draper,SpencerCDixon/draper,Bastes/draper,sideci-sample/sideci-sample-draper,yui-knk/draper,SpencerCDixon/draper,baberthal/draper,baberthal/draper,totzyuta/draper