community signature status is downloaded from DA REST server and displayed on Android - works with hardcoded test parameters
all widgets are set to appropriate values from JSON document received from DA REST server
Community signature status: progress bar is set
ProgressDialog is shown when new data is being fetched from DA REST server
ProgressDialog can be cancelled with back button
Error handling

If community signature document is not found on the server, the user is notified the signature process has not started yet.
If any other error occurs, the user is notified.
ServiceClientJar: non-multipart PUT requests are properly handled (same approach is used as in XmlDocument). HTTP PUT returns status 200 when the request is successful.
Merge branch 'MitjaCommunitySign' into development