Move cross-env to devDependency

ui/package.json

@@ -48,7 +48,6 @@
     "canvas-gauges": "^2.0.9",
     "clipboard": "^1.5.15",
     "compass-sass-mixins": "^0.12.7",
-    "cross-env": "^3.2.4",
     "flot": "git://github.com/flot/flot.git#0.9-work",
     "font-awesome": "^4.6.3",
     "javascript-detect-element-resize": "^0.5.3",
@@ -90,6 +89,7 @@
     "babel-preset-react": "^6.16.0",
     "connect-history-api-fallback": "^1.3.0",
     "copy-webpack-plugin": "^3.0.1",
+    "cross-env": "^3.2.4",
     "css-loader": "^0.25.0",
     "eslint": "^3.4.0",
     "eslint-config-angular": "^0.5.0",