Improved Error Handling

[fschoell]

We should rethink our error handling, especially for the production mode where the errors are just logged on the console and we're never going to see them. Errors and stacktraces of exceptions should be collected and then sent to our server so we can analyze them and see what is actually failing on the client side.

I found a blog entry which uses stacktrace.js for an improved logging service and sends the data to a logstash server. We should take a deeper look into this, as it could help us a lot with future issues.