(pub): v0.1.4 -- optimization docs & internal refactoring

no API surface changes
- the physijs code (physi.js, physijs_worker.js, and vendor/ammo.js)
  has all been moved from app root to physijs/
  - usage of the internal physijs code was not supported or documented
    before, but if you were somehow relying on that, it has now changed

docs improvements
- adds a Bundler Performance Optimizations doc that mainly details how
  one may use the `noParse` config on `ammo` to speed up build times
- adds a README to the physijs code to more explicitly describe what
  kinds of modifications were made to it to work for our use case
- only reports master branch's build status in app root README

internal improvements
- optimizes test bundle speed with the `noParse` option
- reorganizes code into directories to declutter app root
- splits out the test build config from package.json scripts into
  their own config files
- fixes changelog issues with the package.json repository field format

package.json

@@ -1,6 +1,6 @@
 {
   "name": "physijs-webpack",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "PhysiJS port for bundlers with out-of-the-box support for Webpack and Browserify",
   "main": "webpack.js",
   "files": [