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/red/api/admin/nodes_spec.js

@@ -813,7 +813,6 @@ describe("api/admin/nodes", function() {
 
     describe('get icons', function() {
         it('returns icon list', function(done) {
-            debugger;
             initNodes({
                 nodes:{
                     getNodeIcons: function() {