Fix media tests, add test to ensure onComplete isn't called on .stop()
Fix media tests, add test to ensure onComplete isn't called on .stop()

[#336]

appcelerator/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,jvkops/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop,appcelerator/titanium_desktop,wyrover/titanium_desktop,appcelerator/titanium_desktop,jvkops/titanium_desktop,wyrover/titanium_desktop,wyrover/titanium_desktop,wyrover/titanium_desktop,wyrover/titanium_desktop,jvkops/titanium_desktop