The app creates it's own data dir if it doesn't exist
Show unseen notifications count

See #32
Moved New Case button to top-right

See #33 item 6
Added Mark cases as seen button

See #32
Mark cases as seen button works

See #32 item 3
Show only unseen cases button

See #32
Refactored datastore's row to case convertion

See #32
Fix Mark as seen crash on empty table

See #32
Show only unseen cases radio buttons

Fixes #32