IDE: reformat Browser>>commitPackage
server: add FileServer>>respondNotCreatedTo: and FileServer>>respondCreatedTo:
server: call respondCreatedTo:/respondNotCreatedTo: in handlePutRequest:

response handling has been moved to stream events

Otherwise it can happen that the request already
finished and an error on the stream occurs afterwards.
By then the client has already received an OK status
and the error goes unnoticed.
server: recompile
IDE/Browser: print error message if PUT failed
Merge pull request #293 from mkroehnert/server

Show alert in the browser if PUT request fails (fix #90)