Remove unused dependencies

server/package.json

@@ -28,7 +28,6 @@
     "config": "^1.25.1",
     "cors": "^2.8.3",
     "credential": "^2.0.0",
-    "eventemitter3": "^2.0.3",
     "express": "^4.15.2",
     "gridfs-stream": "^1.1.1",
     "handlebars": "^4.0.10",
@@ -46,7 +45,6 @@
     "redis": "^2.7.1",
     "redis-rstream": "^0.1.3",
     "regexp-pattern": "^1.0.4",
-    "replace-ext": "^1.0.0",
     "socket.io": "^2.0.3",
     "urlsafe-base64": "^1.0.0",
     "uuid": "^3.1.0"
@@ -56,7 +54,6 @@
     "babel-plugin-transform-class-properties": "^6.24.1",
     "babel-plugin-transform-object-rest-spread": "^6.23.0",
     "babel-preset-env": "^1.5.2",
-    "istanbul": "^0.4.5",
     "jest": "^21.1.0",
     "monzilla": "^1.1.0"
   },