feat: use ng-packagr for bundling the package

allows the lib to work with universal

BREAKING CHANGE:

The UMD entry point has changed from `angular-resizable-element/dist/umd/angular-resizable-element.js` to `angular-resizable-element/bundles/angular-resizable-element.umd.js`

System.js users will need to update their configs

Closes mattlewis92#79
Closes mattlewis92#80

Author: Matt Lewis

README.md

@@ -16,7 +16,7 @@ https://mattlewis92.github.io/angular-resizable-element/demo/
 - [Installation](#installation)
 - [Documentation](#documentation)
 - [Development](#development)
-- [License](#licence)
+- [License](#license)
 
 ## About
 
@@ -75,14 +75,6 @@ class MyModule {}
 
 You may also find it useful to view the [demo source](https://github.com/mattlewis92/angular-resizable-element/blob/master/demo/demo.component.ts).
 
-### Usage without a module bundler
-```
-<script src="node_modules/angular-resizable-element/angular-resizable-element.js"></script>
-<script>
-    // everything is exported on the  angularResizableElement namespace
-</script>
-```
-
 ## Documentation
 All documentation is auto-generated from the source and can be viewed here:
 https://mattlewis92.github.io/angular-resizable-element/docs/