AndroidHttpClient leaked

Hi,

I'm just doing a quick test around your Android automation client and I saw that when I change the destination server dynamically, you create a new AndroidAutomationClient. However, the AndroidHttpClient the former AndroidAutomationClient holds is not closed, so an exception is thrown (java.lang.IllegalStateException: AndroidHttpClient created and never closed). I have added locally this stupid thing so it's closed when the AndroidAutomationClient is disposed:

    @Override
    protected void finalize() {
        ((AndroidHttpClient) this.http).close();
    }