remove connect export in favor of single function

Since connect was the only function exported, we can just export the
function directly to make things simpler.

test/index.js

@@ -21,7 +21,7 @@ test('setup local http server', function(done) {
 });
 
 test('setup localtunnel client', function(done) {
-    var client = localtunnel.connect({
+    var client = localtunnel({
         port: test._fake_port
     });
 
@@ -67,7 +67,7 @@ test('query localtunnel server w/ ident', function(done) {
 });
 
 test('request specific domain', function(done) {
-    var client = localtunnel.connect({
+    var client = localtunnel({
         port: test._fake_port,
         subdomain: 'abcd'
     });