(feat) Refactored to use RWLock instead of Mutex.
(feat) Scaffolded Share middleware.
(feat) Impled Clone for Shared.
(feat) Switched to using ShareableMiddleware.
(feat) Added public constructor.
(feat) Added convenience mixin for Chain.
(fix) Removed duplicate definition of new.
Merge pull request #2 from iron/feat/shared

(feat) Implemented Shared.