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

contrib/auto-render/auto-render.js

@@ -1,7 +1,7 @@
 /* eslint no-console:0 */
 /* global katex */
 
-const splitAtDelimiters = require("./splitAtDelimiters");
+import splitAtDelimiters from "./splitAtDelimiters";
 
 const splitWithDelimiters = function(text, delimiters) {
     let data = [{type: "text", data: text}];
@@ -99,4 +99,5 @@ const renderMathInElement = function(elem, options) {
     renderElem(elem, optionsCopy);
 };
 
-module.exports = renderMathInElement;
+
+export default renderMathInElement;

contrib/auto-render/splitAtDelimiters.js

@@ -99,4 +99,4 @@ const splitAtDelimiters = function(startData, leftDelim, rightDelim, display) {
     return finalData;
 };
 
-module.exports = splitAtDelimiters;
+export default splitAtDelimiters;