Remove grunt

package.json

@@ -26,7 +26,6 @@
     "dockerode": "^2.5.3",
     "express": "^4.2.0",
     "fs-extra": "^0.16.3",
-    "grunt-mkdir": "^1.0.0",
     "heapdump": "^0.3.5",
     "lockfile": "^1.0.3",
     "logger-sharelatex": "git+https://github.com/sharelatex/logger-sharelatex.git#v1.5.9",
@@ -44,19 +43,12 @@
     "wrench": "~1.5.4"
   },
   "devDependencies": {
-    "mocha": "^4.0.1",
-    "coffee-script": "1.6.0",
-    "chai": "~1.8.1",
-    "sinon": "~1.7.3",
-    "grunt": "~0.4.2",
-    "grunt-contrib-coffee": "~0.7.0",
-    "grunt-contrib-clean": "~0.5.0",
-    "grunt-shell": "~0.6.1",
-    "grunt-mocha-test": "~0.8.1",
-    "sandboxed-module": "~0.3.0",
-    "timekeeper": "0.0.4",
-    "grunt-execute": "^0.1.5",
     "bunyan": "^0.22.1",
-    "grunt-bunyan": "^0.5.0"
+    "chai": "~1.8.1",
+    "coffee-script": "1.6.0",
+    "mocha": "^4.0.1",
+    "sandboxed-module": "~0.3.0",
+    "sinon": "~1.7.3",
+    "timekeeper": "0.0.4"
   }
 }