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/logic/16-range_spec.js

@@ -135,11 +135,13 @@ describe('range Node', function() {
             var sinon = require('sinon');
             sinon.stub(rangeNode1, 'log', function(log) {
                 if (log.indexOf("notnumber") > -1) {
+                    rangeNode1.log.restore();
                     done();
                 } else {
                     try {
                         should.fail(null, null, "Non-number inputs should be reported!");
                     } catch (err) {
+                        rangeNode1.log.restore();
                         done(err);
                     }
                 }