Connection: remove deprecated JS API usage

Fixes: https://github.com/mscdex/node-imap/issues/483

lib/Connection.js

@@ -1126,7 +1126,7 @@ Connection.prototype.setKeywordsSince = function(uids, keywords, modseq, cb) {
 // END Extension methods =======================================================
 
 // Namespace for seqno-based commands
-Connection.prototype.__defineGetter__('seq', function() {
+Object.defineProperty(Connection.prototype, 'seq', { get: function() {
   var self = this;
   return {
     delKeywords: function(seqnos, keywords, cb) {
@@ -1222,7 +1222,7 @@ Connection.prototype.__defineGetter__('seq', function() {
                   cb);
     }
   };
-});
+}});
 
 Connection.prototype._resUntagged = function(info) {
   var type = info.type, i, len, box, attrs, key;
@@ -1708,7 +1708,6 @@ Connection.prototype._starttls = function() {
     self._sock.on('timeout', this._onSocketTimeout);
     self._sock.setTimeout(self._config.socketTimeout);
 
-
     self._parser.setStream(self._sock);
   });
 };