Move build dep form "defDependencies" to "dependencies"

See
https://devcenter.heroku.com/articles/nodejs-support#customizing-the-build-process

package.json

@@ -3,6 +3,9 @@
   "version": "0.0.1",
   "description": "Das neue web client for Ascribe",
   "main": "js/app.js",
+  "engines": {
+    "node": "0.10.x"
+  },
   "scripts": {
     "lint": "eslint ./js",
     "postinstall": "npm run build",
@@ -15,13 +18,19 @@
   "devDependencies": {
     "babel-eslint": "^3.1.11",
     "babel-jest": "^4.0.0",
-    "babelify": "^6.1.2",
-    "bootstrap-sass": "^3.3.4",
-    "browser-sync": "^2.7.5",
-    "browserify": "^9.0.8",
-    "envify": "^3.4.0",
+    "jest-cli": "^0.4.0"
+  },
+  "dependencies": {
     "eslint": "^0.22.1",
     "eslint-plugin-react": "^2.5.0",
+    "browser-sync": "^2.7.5",
+    "watchify": "^3.1.2",
+    "yargs": "^3.10.0",
+    "lodash": "^3.9.3",
+    "react-textarea-autosize": "^2.2.3",
+    "reactify": "^1.1.0",
+    "vinyl-buffer": "^1.0.0",
+    "vinyl-source-stream": "^1.1.0",
     "gulp": "^3.8.11",
     "gulp-concat": "^2.5.2",
     "gulp-eslint": "^0.13.2",
@@ -32,16 +41,10 @@
     "gulp-sourcemaps": "^1.5.2",
     "gulp-uglify": "^1.2.0",
     "gulp-util": "^3.0.4",
-    "jest-cli": "^0.4.0",
-    "lodash": "^3.9.3",
-    "react-textarea-autosize": "^2.2.3",
-    "reactify": "^1.1.0",
-    "vinyl-buffer": "^1.0.0",
-    "vinyl-source-stream": "^1.1.0",
-    "watchify": "^3.1.2",
-    "yargs": "^3.10.0"
-  },
-  "dependencies": {
+    "browserify": "^9.0.8",
+    "envify": "^3.4.0",
+    "babelify": "^6.1.2",
+    "bootstrap-sass": "^3.3.4",
     "alt": "^0.16.5",
     "classnames": "^1.2.2",
     "es6-promise": "^2.1.1",