Remove unused dependency

This dependency where installed, but it seems like they were never used.
Seems like it's a remaining piece from the the prototyping phase of the
project.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

package.json

@@ -58,7 +58,6 @@
     "js-sequence-diagrams": "^1000000.0.6",
     "js-url": "^2.3.0",
     "js-yaml": "^3.7.0",
-    "jsdom-nogyp": "^0.8.3",
     "keymaster": "^1.6.2",
     "list.js": "^1.5.0",
     "lodash": "^4.17.4",