Add loading feature to preview on new tip page
Add weekly stats section to Admin Dashboard

 - Add weekly stats method to Dashboards Controller
 - Add partial for weekly stats
 - Add view for weekly stats
 - Add route for weekly stats
 - Remove method from tip model and turn into block in Dashboard
   Controller
Improve loading functionality on Preview
Update weekly stats for Admin Dashboard

 - Refactor sql query for weekly stats
 - Add link in dashboard view to connect to weekly stats view
Merge branch 'weeklystats'
Merge branch 'githubLoad'