Update dependencies and remove outdated ones (#722)

* Update dependencies and remove outdated ones
* Add package lock file
* Add minified file
* Karma now uses headless browser to run QUnit
* Add to readme that node and npm install is required
* Update license info
* Add lint-new but don't use it in CI yet

.gitignore

@@ -1,3 +1,4 @@
+/js/impress.min.js.map
 /js/impress.min.js
 /node_modules
 /npm-debug.log