Remove unneeded dependencies

package.json

@@ -42,6 +42,7 @@
   ],
   "dependencies": {
     "chalk": "^0.5.1",
+    "cross-spawn": "^0.2.3",
     "get-stdin": "^3.0.0",
     "meow": "^2.0.0",
     "mkdirp": "^0.5.0",
@@ -49,15 +50,12 @@
     "nan": "^1.3.0",
     "node-watch": "^0.3.4",
     "object-assign": "^1.0.0",
-    "shelljs": "^0.3.0",
-    "sinon": "^1.10.3"
+    "shelljs": "^0.3.0"
   },
   "devDependencies": {
     "coveralls": "^2.11.1",
-    "cross-spawn": "^0.2.3",
     "jscoverage": "^0.5.6",
     "jshint": "^2.5.5",
-    "mocha-lcov-reporter": "^0.0.1",
-    "object-assign": "^1.0.0"
+    "mocha-lcov-reporter": "^0.0.1"
   }
 }