calendar screen
Entry and Entry detail classes.
Storage for enties using Google Cloud Storage as files

Demo UI for testing storage
updated gitignore to ignore widgetset
Merge branch 'master' of https://github.com/janmilinds/VaadinExcercise
add widgetset for the calendar addon
Merge branch 'sina' of https://github.com/janmilinds/VaadinExcercise into ErnoBranch
Merged Sina's Calendar to work with the login screen.