feat(rollup): switch from webpack to rollup for bundling

.gitignore

@@ -8,7 +8,6 @@ node_modules/
 
 output
 build
-browser_build
 .bin
 npm-debug.log
 builderror.log

README.md

@@ -2,7 +2,7 @@
 
 BSON is short for Bin­ary JSON and is the bin­ary-en­coded seri­al­iz­a­tion of JSON-like doc­u­ments. You can learn more about it in [the specification](http://bsonspec.org).
 
-This browser version of the BSON parser is compiled using [webpack](https://webpack.js.org/) and the current version is pre-compiled in the `browser_build` directory.
+This browser version of the BSON parser is compiled using [rollup](https://rollupjs.org/) and the current version is pre-compiled in the `dist` directory.
 
 This is the default BSON parser, however, there is a C++ Node.js addon version as well that does not support the browser. It can be found at [mongod-js/bson-ext](https:/mongodb-js/bson-ext).
 
@@ -18,7 +18,7 @@ npm run build
 A simple example of how to use BSON in the browser:
 
 ```html
-<script src="./browser_build/bson.js"></script>
+<script src="./dist/bson.js"></script>
 
 <script>
  function start() {

alternate_parsers/faster_bson.js

@@ -1,5 +1,5 @@
 /// reduced to ~ 410 LOCs (parser only 300 vs. 1400+) with (some, needed) BSON classes "inlined".
-/// Compare ~ 4,300 (22KB vs. 157KB) in browser build at: https:/mongodb/js-bson/blob/master/browser_build/bson.js
+/// Compare ~ 4,300 (22KB vs. 157KB) in browser build at: https:/mongodb/js-bson/blob/master/dist/bson.js
 
 module.exports.calculateObjectSize = calculateObjectSize;
 

bower.json

@@ -7,7 +7,7 @@
  "parser"
  ],
  "author": "Christian Amor Kvalheim <[email protected]>",
- "main": "./browser_build/bson.js",
+ "main": "./dist/bson.js",
  "license": "Apache-2.0",
  "moduleType": [
  "globals",