Webpack dev server (#902)

* Initial webpack config. Moving to ES6 modules. Some module cleanup.

* WIP

* WIP

* Removing commented out code.

* Removing old deps.

* Removing the build script (used for testing).

* Working tests.

* Switching to node api over cli.

* Updating per comments. Still need to fix server.js to properly run the selenium tests.

* Cleaning up the config.

* More cleanup.

* Bringing back server.js for selenium tests.

* Bringing back old dependencies.

* Adding back eslint rules for webpack config. Final cleanup for webpack config.

* Pointing to correct pre-existing module versions. Adding some extra logic to server.js to ensure it gets transpiled properly.

* Getting make build to work again. Updating package.json with some shortcut scripts.

* Resolving conflict.

* Reverting back to commonjs modules.

* Removing extra spaces in babelrc

package.json

@@ -18,6 +18,8 @@
   "devDependencies": {
     "babel-eslint": "^7.2.0",
     "babel-jest": "^20.0.3",
+    "babel-loader": "^7.1.2",
+    "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-class-properties": "^6.23.0",
     "babel-plugin-transform-runtime": "^6.15.0",
     "babel-preset-es2015": "^6.18.0",
@@ -37,6 +39,7 @@
     "js-yaml": "^3.3.1",
     "jspngopt": "^0.2.0",
     "less": "~2.7.1",
+    "less-plugin-clean-css": "^1.5.1",
     "morgan": "^1.7.0",
     "nomnom": "^1.8.1",
     "object-assign": "^4.1.0",
@@ -44,7 +47,9 @@
     "pre-commit": "^1.2.2",
     "selenium-webdriver": "^2.48.2",
     "sri-toolbox": "^0.2.0",
-    "uglify-js": "~2.7.5"
+    "uglify-js": "~2.7.5",
+    "webpack": "^3.6.0",
+    "webpack-dev-server": "^2.8.2"
   },
   "bin": "cli.js",
   "scripts": {
@@ -52,8 +57,13 @@
     "flow": "flow",
     "jest": "jest",
     "coverage": "jest --coverage",
+    "copy": "cp -a static/. build/ && cp -a contrib build/",
+    "clean": "rm -rf build/* node_modules/",
+    "clean-install": "npm run clean && npm i",
     "test": "check-dependencies && npm run lint && npm run flow && npm run jest",
-    "start": "check-dependencies && node server.js",
+    "build-css": "lessc --clean-css static/katex.less build/katex.css",
+    "prestart": "npm run build-css && npm run copy",
+    "start": "check-dependencies && node webpackDevServer.js",
     "prepublishOnly": "make NIS= dist"
   },
   "pre-commit": [