Clone the options object

Or else bad things will happen!
Expose the query on the options for a `destroying` event (fixes #231)
Merge pull request #233 from valet-io/patch/destroy-query

Expose the query on the options for a `destroying` event (fixes #231)
Added unit test
Added an actual check for inequality for `options`
Changed test description
Adding Model.collection static method

Creates a new collection where the Collection's model
is set as the current model.
add guard for empty options in Model.collection
Merge pull request #232 from johanneslumpe/clone-options

Clone the options object
some docs tweaks
Merge pull request #235 from tgriesser/model-collection

Adding Model.collection static method
docs prep for release
release 0.6.4
link tag fix
italicizing static methods
fix broken italic tag
locking down version of backbone for semver, update id test