Introduce onError to signal about errors to start listening. See for details

https://github.com/cmusphinx/pocketsphinx-android-demo/pull/3

Thanks to louisb0b



git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/pocketsphinx-android-demo@12627 94700074-3cef-4d97-a70e-9c8c206c02f5