fix recorder: can now record and play

remove single parameter AudioRecorderActivity constructor:
    when an intent is started, you can only pass the class and cannot
    pass extra params to the activity constructor.
    Instead add params through the intent
    http://stackoverflow.com/a/3303512/1123985
- fix StartRecording:
    myRecorder.setAudioEncoder should come after myRecordersetOutputFile
    code sample:
    http://developer.android.com/guide/topics/media/audio-capture.html
- fix capitalization typos