fix many test problems (#1677)

* fix many test problems

- adds [stoppable](https://npm.im/stoppable) to force-stop net & http
  servers
- upgrades to latest mocha
- much cleanup of servers
- some removal of useless code

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

* increase wait time to hack at race condition

* PoC with fork of stoppable

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

* fix custom stoppable url for newer npm

* make travis go faster; attempt to avoid npm troubles

* fix coveralls executable path

* add extra time for flake to trigger spec

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

test/nodes/core/parsers/70-XML_spec.js

@@ -24,6 +24,10 @@ describe('XML node', function() {
         helper.startServer(done);
     });
 
+    after(function(done) {
+        helper.stopServer(done);
+    });
+
     afterEach(function() {
         helper.unload();
     });