Allow timeouts to Operation deref and wait-for

Add clojure.lang.IBlockingDeref to Operation, and add an arity to wait-for.
Updated project.clj, release notes and readme for 0.2.2
Merge branch 'release/0.2.2'
Merge tag '0.2.2' into develop

pallet-fsmop-0.2.2
Updated version for next release cycle