Support DirectPlayer::nGetDuration. Fixes #653
Add getDuration test
Merge branch 'master' of https://github.com/andreasgal/j2me.js into get_Duration

Conflicts:
	tests/automation.js
Merge branch 'master' of https://github.com/andreasgal/j2me.js into get_Duration

Conflicts:
	midp/media.js
	tests/automation.js
Merge branch 'master' of https://github.com/andreasgal/j2me.js into get_Duration

Conflicts:
	tests/automation.js
Merge pull request #654 from marco-c/get_Duration

Implement getDuration