Upgrade the source to use ES6 syntax including classes, import and static properties (#679)

* Add babel transform-class-properties to have static class properties

* Upgrade Lexer and Parser files to use ES6 classes

* Update eslint max line length to 90 character (more indent because of using ES6 classes)

* Upgrade eslint and jasmin to support ES stage-2 features

* Use static properties to place constants near their functions

* Migrate all remaining sources to ES6 syntax

* Increase eslint max line length to 84

* Remove non-babelified endpoint in dev server.js

* Clean up server.js functions after removing browserified

* Make screenshotter not to use babel endpoint as we babelify everything now

test/jasmine.json

@@ -5,6 +5,7 @@
     "contrib/**/*[sS]pec.js"
   ],
   "helpers": [
-    "helpers/**/*.js"
+    "helpers/**/*.js",
+    "node_modules/babel-core/register.js"
   ]
 }