Adds Javascript Support

Summary:
- As mentioned in the title, this PR adds Javascript support to Yoga. Two different builds are included in this PR thanks to [nbind](https://github.com/charto/nbind), which conveniently allow to target both Node.js' native addons and browser environments via asmjs with approximately the same codebase. That should solve #215.

- All tests successfully pass on both codepaths. You can run `yarn test:all` inside the `javascript` directory to test it.

- Because of a bug in nbind, the [following PR](https://github.com/charto/nbind/pull/57) needs to be merged and a new version released before this one can be safely merged as well.

- I had to use `double` types instead of `float` in the C++ bindings because of an Emscripten [bug](https://github.com/kripken/emscripten/issues/3592) where symbols aren't correctly exported when using floats.

- There's some tweaks to do before this PR is 100% ready to merge, but I wanted to have your opinion first. What do you think of this?

 ---

To do:

- [x] Ensure th
Closes https://github.com/facebook/yoga/pull/304

Reviewed By: mikearmstrong001

Differential Revision: D4375187

Pulled By: emilsjolander

fbshipit-source-id: 47248558a9506b7c512b5ef281cd12fe1a60cab7

javascript/webpack.config.js

@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+module.exports = {
+
+    entry: "./sources/entry-browser",
+
+    output: {
+
+        path: require("path").resolve(__dirname, "dist"),
+        filename: "Yoga.bundle.js",
+
+        libraryTarget: "umd",
+        library: "Yoga"
+
+    },
+
+    node: {
+
+        fs: "empty",
+        module: "empty"
+
+    },
+
+    performance: {
+
+        hints: false
+
+    },
+
+    plugins: [
+
+        new (require("webpack").BannerPlugin)(require("fs").readFileSync(__dirname + "/../LICENSE", "utf8"))
+
+    ]
+
+};