services.py: Allow only authenticated users to use the service methods provided.
gwt: Separate the status bar from the header to allow displaying of messages on all screens.
gwt: Fix issue with Firefox not accepting Enter for form submission.
gwt: Update html file to use Standards mode doctype, as Quirks Mode is no longer supported.
gwt: More explicit error messages when the server returns a non-200 (OK) response code.
gwt: Send username and password through POST instead of GET.
services.py: Add warning message related to deploying services.py in a UserDir.
Merge pull request #58 from calin-iorgulescu/master

Security fixes for the services and the GWT interface. Minor other enhancements.