stream blob list

Example of usage:

    5> {ok, Reader} = coffercli:enumerate_init(Storage).
    {ok,{enumerate_reader,{client,hackney_tcp_transport,
                                  "localhost",8080,netloc,
                                  [{pool,<0.75.0>}],
                                  #Port<0.5014>,infinity,false,5,false,nil,undefined,
                                  connected,on_body,nil,normal,#Fun<hackney_request.send.2>,
                                  waiting,4096,<<"C\r\n{\"blobs\":
[\n\r"...>>,
                                  {1,1},
                                  nil,<<"chun"...>>,<<...>>,...},
                          <<>>}}
    6>
    6> {ok, Bin, Reader1} = coffercli:enumerate(Reader).
    {ok,{<<"hashtype-20130608test1">>,22},
        {enumerate_reader,{client,hackney_tcp_transport,"localhost",
                                  8080,netloc,
                                  [{pool,<0.75.0>}],
                                  #Port<0.5014>,infinity,false,5,false,nil,undefined,
                                  connected,on_body,nil,normal,#Fun<hackney_request.send.2>,
                                  {stream,#Fun<hackney_response.0.105148979>,
                                          {0,0},
                                          #Fun<hackney_response.1.105148979>},
                                  4096,<<"30\r\n,\n{\"blob"...>>,
                                  {1,1},
                                  nil,<<...>>,...},
                          <<"{\"blobref\":\"hashtype-20130608test10\",\"size\":29}">>}}