Use latest versions of development dependencies

Let's make sure we get the latest features and fixes for all the
tools we are using.

package.json

@@ -40,32 +40,32 @@
   },
   "homepage": "https://github.com/novnc/noVNC",
   "devDependencies": {
-    "babel-core": "^6.22.1",
-    "babel-plugin-add-module-exports": "^0.2.1",
+    "babel-core": "*",
+    "babel-plugin-add-module-exports": "*",
     "babel-plugin-import-redirect": "*",
-    "babel-plugin-syntax-dynamic-import": "^6.18.0",
-    "babel-plugin-transform-es2015-modules-amd": "^6.22.0",
-    "babel-plugin-transform-es2015-modules-commonjs": "^6.18.0",
-    "babel-plugin-transform-es2015-modules-systemjs": "^6.22.0",
-    "babel-plugin-transform-es2015-modules-umd": "^6.22.0",
-    "babel-preset-es2015": "^6.24.1",
-    "babelify": "^7.3.0",
-    "browserify": "^13.1.0",
+    "babel-plugin-syntax-dynamic-import": "*",
+    "babel-plugin-transform-es2015-modules-amd": "*",
+    "babel-plugin-transform-es2015-modules-commonjs": "*",
+    "babel-plugin-transform-es2015-modules-systemjs": "*",
+    "babel-plugin-transform-es2015-modules-umd": "*",
+    "babel-preset-es2015": "*",
+    "babelify": "*",
+    "browserify": "*",
     "chai": "*",
-    "commander": "^2.9.0",
-    "es-module-loader": "^2.1.0",
-    "eslint": "^4.16.0",
-    "fs-extra": "^1.0.0",
+    "commander": "*",
+    "es-module-loader": "*",
+    "eslint": "*",
+    "fs-extra": "*",
     "jsdom": "*",
-    "karma": "^1.3.0",
-    "karma-mocha": "^1.3.0",
-    "karma-mocha-reporter": "^2.2.0",
-    "karma-sauce-launcher": "^1.0.0",
-    "karma-sinon-chai": "^2.0.0",
-    "mocha": "^3.1.2",
+    "karma": "*",
+    "karma-mocha": "*",
+    "karma-mocha-reporter": "*",
+    "karma-sauce-launcher": "*",
+    "karma-sinon-chai": "*",
+    "mocha": "*",
     "node-getopt": "*",
     "po2json": "*",
-    "requirejs": "^2.3.2",
+    "requirejs": "*",
     "rollup": "*",
     "rollup-plugin-node-resolve": "*",
     "sinon": "*",