Update sl2

- new version of sl2
- removed lib folder (the lib folder will be created by sl2)
- deleted unused html file
Clean up and latest tests

- removed some unused parts (example app)
- fixed routes (there is now an ajax handler to handle sl to scala
  function calls)
- testing most features now in koch.scala.htm (still there are missing
  some good tests)
- added some example functions to use in tests
  (app/callable_functions/Examples.scala)
updated .gitignore