Revert non-model sync commits.

Revert "Allow non-model object as second argument, with test."
This reverts commit 32743e6b60a9b02619cd39f1cbe00d3dd77639a9.

Revert "trigger request event only if model extends Backbone.Events, and fix whitespace"
This reverts commit 6d72e1be3568dad0556ceb438ab7d45ea29f365f.

Revert "add if statement and add passing test"
This reverts commit 2caf748651c5f927d9ce2c47723f307c5578f1ef.