Merge pull request #11 from armandopmj/feat/memCache

(feat) create memcache class and export a memCache object
(feat) work on serveImage function, (fix) correct name collision in MemCache and implement pascal case for class name
Merge pull request #12 from lowi0008/master

(feat) work on serveImage function, (fix) correct name collision in MemC...
(feat) work on serveImages function, (fix) fix  memCache object export
Merge pull request #13 from lowi0008/master

(feat) work on serveImages function, (fix) fix  memCache object export
(feat) add getRandomImg and getRedirectUrl methods to MemCache
(Rebase)
(Rebase) Fix merge coflicts