Assign users to tasks and tasks to users.
Fixed tasks#show
added "Private" attribute to Grants

Private grants are only viewable by Organization admins, whereas public grants can be seen by all organization users.
Fixed assigning bug.
Minor task assignment fiddling.
Moved header text.
Refactored views. Private attribute still WIP
Non-admin users can see their assigned tasks only
Layout/story/style WIP
Added 'done' boolean to tasks.
Merge branch 'permissions' of github.com:omahacodeschool/grant-tracker into heather

Conflicts:
	app/views/pages/_dash.html.erb
	db/schema.rb
Removed binding.pry