Remove urchin protocol.
Remove obsolete PageViewActivity.
Remove PageViewActivity tests.
Remove obsolete Visitor.FirstVisitAt
Remove obsolete Session.HitId
Remove obsolete Session.HitCount
Remove obsolete Session.PreviousStartedAt
Remove obsolete Session.Number
Remove obsolete Session.StartedAt
Remove obsolete Session.
Minor clean-up.
Update README.md
Merge pull request #9 from AttackPattern/dev

Promote latest dev changes to master.
Ensure suspend without shutdown resumes with correct queue.
Merge remote-tracking branch 'origin/master' into remove-urchin
Merge pull request #10 from AttackPattern/remove-urchin

Remove urchin protocol support from master in preparation for official 1.0 release.
Remove references to Urchin.
Remove Epoch code that only Urchin used.
Remove Urchin-only fields from TransactionActivity.
Add missing currency code to debugger.