add logout tab and related functionality
Merge pull request #1 from BaBuDe/pageFlow

add logout tab and related functionality
authentication through states
Remove obsolete checkSession() call
updated authentication structure and page flow
Merge pull request #2 from jamesyothers/master

Update authentication method and structure
reformatted offers for database interaction
messages working for one user
Merge pull request #3 from jamesyothers/master

messages working for one user