Add logout link to menu

just a link to index.psp, which will invalidate the session
Fixing query in verification.psp

Was previously showing all barcodes for the user, rather than
only the barcodes for the current kit being displayed.
Adding other sites to add sample page
Merge pull request #180 from adamrp/logout_link

Add logout link to menu
Merge pull request #181 from adamrp/verification_query

Fixing query in verification.psp
Merge pull request #182 from meganap/agut

Adding other sites to add sample page