Refactoring Servlets and add Service classes
Bugfix invalid application name when uploading a app + add app ID to vhost list
Bugfixing
Add address/port + worker number to container information
Change to uncamelcased worker_number instead of workerNumber
Add thumbnail servlet to return thumbnail images for installed web apps
Change to UUID to primary key for AppNode + add servlet/service to load a apps thumbnail
Merge pull request #3 from wagnert/master

Change to UUID to primary key for AppNode + add servlet/service to load a apps thumbnail