Fix link in README
Workshop fixes
Update README
Update README
Update README
- Added some tests to practise callbacks
- Reordered and supplemented information about callbacks
- Fixed title
Merge pull request #2 from hsa-js-ws1415/callbacks

- Added some tests to practise callbacks
Add slides about prototypes
Refactor slides about functions
Improve function workshop
Add slides about callbacks
Add uebungen folder
Update slides and workshops