removing user email validation
Massive refactoring of requirements to user.proofs

- moving views from requirements#index to proofs#index
- adding .completed and #completed? for proof model
- fix routes
- fix pdf generation which is called on /report url now
- proofs can be accessed at /checklist url now
- fixing progress bar generation
renamin assets, removing unused home.js.coffee
removing unused requirements controller actions
redirect to /checklist on signin
redirect to /checklist on user update
note for read Requirement ability
unused requirements_helper.rb