Implement `$.fn.get`
Deprecate `$.fn.toArray`

Because `$.fn.get` is more powerful than `toArray` and because `toArray`
is not implemented by jQuery, the `toArray` method is no longer
necessary. Deprecate it so it may be more safely removed in some future
version of this library.
Merge pull request #415 from jugglinmike/get

Implement `$.fn.get`