Fixed it so that the status in the datastore is shown in the admin 
page.
Dummy commit.
Merge branch 'andres_delete'

Conflicts:
	war/WEB-INF/classes/.gitignore
Implemented delete functionality. I also allowed for image/pjpeg files
to be uploaded. I created the getSubmission(...) object in the
DatastoreControl to obtain information about a specific submission. I
also corrected a mispelling in the name of the DatastoreControl method
that deletes a submission. I corrected a problem it had with finding
submissions.
Added the DeleteResult object.
Delete functionality.
Merge branch 'master' of
https://github.com/Zhibin-Zhang/PosterManagementSystem.git

Conflicts:
	war/WEB-INF/appengine-web.xml