Merge pull request #28 from darabun/master

(feat) Add useragent(Device) to memcache
(feat) Send device data to database
Merge pull request #29 from nrobeR/master

(feat) Send device data to database
(feat) Fix the setTimeOut for the first view on each abTest
Merge pull request #30 from nrobeR/feat/ab_test

(feat) Fix the setTimeOut for the first view on each abTest
(feat) Add no-cache to header to prevent gmail caching