(feat) Scaffolded library.
(feat) Implemented Clone for Sendable data.
(feat) Implemented Middleware for Persistent.
(feat) Publicized data field.
(test) Tested Persistent.
(feat) Refactored to use RWLock instead of Mutex.
(test) Updated tests to use RWLock.
(doc) Added hitcounter example.
(fix) Fixed travis.
Merge pull request #1 from iron/feat/persistent

(feat) Added Persistent Middleware.