Support for filtering the silence inside the single utterance



git-svn-id: http://svn.code.sf.net/p/cmusphinx/code/trunk@12648 94700074-3cef-4d97-a70e-9c8c206c02f5
Added start_stream to swig



git-svn-id: http://svn.code.sf.net/p/cmusphinx/code/trunk@12649 94700074-3cef-4d97-a70e-9c8c206c02f5