add js and layout file with button
* add select random button to logged in activities page
* add activity_view in views
* add javascript ajax
* add go home button on random activity page
* added break after rating in create_activity view
fixed security flaw with seeing random activities when not logged in.
remove activity view and add ajax highlight background of random activity selection
Merge pull request #14 from gopher-snakes-2013/select-random

Add select random activity feature