Merge pull request #19 from lmle/feat/client

(feat) Add loading animation on Thank You page
(feat) Add logic to only show sellers items on Sellers Page
Merge pull request #20 from blankmaker/feat/seller-page

(feat) Add logic to only show sellers items on Sellers Page
Rebase
Completed Push Notification with PubNub
Merge pull request #21 from armandopmj/master

Completed Push Notification with PubNub
(feat)(bug) Add 'card flipping' for image, but only works on hover