Add method to change window size

[Pitel]

I need to have way more sensitivity.

Half a second, and more than 75 % of samples is not acceptable for my use case. I can pick the phone from table and put it back withou triggering hearShake. And I've senstivity set to 10.

I need to detect the phone flipping over from synchronization cradle.

[JakeWharton]

If you are willing to send a pull request for the feature with a test or two we will evaluate it. Otherwise your best bet is to just copy the file into your project and modify it to suit your needs.