Simpler test added for `merge: true` on Collection.reset.
Simpler test added for `merge: true` on Collection.reset.

Revert "Merge pull request #320 from elasticsales/collection-set-vs-reset"

This reverts commit c31ea90071753f1f475f780ef4143229d5a28f19, reversing
changes made to 9b52eb220bb86a2da5e41c08e55b76a1f2108871.

Feasul/Backbone-relational,closeio/Backbone-relational,goodwall/Backbone-relational,leeleo26/Backbone-relational,nikolas/Backbone-relational,BothMedia/Backbone-relational,nikolas/Backbone-relational,matghaleb/Backbone-relational,goodwall/Backbone-relational,closeio/Backbone-relational,airbnb/Backbone-relational,PaulUithol/Backbone-relational,xcambar/Backbone-relational,PaulUithol/Backbone-relational,matghaleb/Backbone-relational,Feasul/Backbone-relational,xcambar/Backbone-relational,leeleo26/Backbone-relational