Merge pull request #22 from armandopmj/feat/memCache

(feat) add viewTime and clickTime to memcache
(feat) Add timestamp on view/click. Fix view/click count for winning image
Merge pull request #23 from darabun/master

(feat) Add timestamp on view/click. Fix view/click count for winning image.
(add setInterval in memcache for DB queries)
(feat) INSERT memcache campaigns and ab_img data
(feat) INSERT memcache campaigns and ab_img data