Remove length property as it can be misleading

lib/imap.js

@@ -229,7 +229,6 @@ ImapConnection.prototype.connect = function(loginCb) {
             && /^BODY\[/i.test(litType)) {
           var msg = new ImapMessage();
           msg.seqno = parseInt(m[1], 10);
-          msg.length = indata.expect;
           requests[0]._msg = msg;
           requests[0]._fetcher.emit('message', msg);
           indata.streaming = true;
@@ -287,7 +286,6 @@ ImapConnection.prototype.connect = function(loginCb) {
                   // a body was given as a non-literal string
                   var data = new Buffer(msg.body, 'binary');
                   delete msg.body;
-                  msg.length = data.length;
                   requests[0]._fetcher.emit('message', msg);
                   msg.emit('data', data);
                   msg.emit('end');
@@ -295,7 +293,6 @@ ImapConnection.prototype.connect = function(loginCb) {
                   // non-body fetch
                   if (Object.keys(msg).indexOf('body') > -1)
                     delete msg.body;
-                  msg.length = 0;
                   requests[0]._fetcher.emit('message', msg);
                   msg.emit('end');
                 }