(pub): publish v0.1.3

- no actual API surface changes
- 1 breaking-ish, non-API change as the License has changed
  - previously was MIT in package.json and no LICENSE file
    - for reference, Physijs is MIT, and physijs-browserify is ISC
  - now under Apache 2.0 and has LICENSE file
    - I prefer Apache and use it in all my other libraries, though am
      open to changing it back if discussion reveals this as a problem
      - they are similar enough, so I don't expect there to be and
        therefore released as patch

- some other minor packaging changes:
  - author: handle -> name
  - adds CHANGELOG.md (and changelog script)

- internal improvements
  - adds a webpack test
  - adds Travis CI support
  - updates devDeps

package.json

@@ -1,6 +1,6 @@
 {
   "name": "physijs-webpack",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "PhysiJS port for bundlers with out-of-the-box support for Webpack and Browserify",
   "main": "webpack.js",
   "files": [