Tests for the merging of options in Animations

This came from PR #56

I would love to also help with this, but I'm not sure how to test the merging of options

Test bellow wouldn't really test it, right?

``` ruby
it 'should throb with custom durations' do
@viewq.animations.throb(duration: 0.0, duration_out: 0.0).is_a(RubyMotionQuery::RMQ).should == true
end
```

I think we could pass any options there and the test would still pass.

Any ideas?

And thanks for RMQ, it's really easy to get going with and and quite useful!

Read PR #56 and the existing animation test around the shown throb example first. Exercise option merging with custom durations and verify the resulting animation behavior, rather than only checking the return type; done means the test distinguishes correct merging from an arbitrary options call.

Written by the indexing model from the issue text.