basic cancan installed without yet integrating into my app
wrote out next steps for Admin and added CanCan Ability model
wrote first basic rspec tests and began tdd of admin and global exercise features
I want to bring in master's updates to make sure there is no future problem when I merge this outdated branch with master.

Merge branch 'master' of https://github.com/henryvw/stoic_compass into cancan
added and customized active_admin, created global_exercises variable in exercise controller to display for all users
Merge pull request #11 from Henryvw/cancan

Active Admin, Global Exercises Feature