adds link to users for admins #43
adds placeholders for forms #43 #44

Placeholder for new admin form
Placeholder for user invitation form
Fix book page view #43

Make view consistent and give edit/status column a nice header.
Remove sort from Author column.
app layout, admin form, routes #43

Moves add admin form before impersonate links
adds route for new admin
adds new admin route to form partial
controller, helper, layouts, routes #43

Adds create action to users controller
adds helper for flash notice
adds layout for flash notice
changes route to users#create
Users Controller, helper specs #43

redirect non-admins to root
redirect to users after update
remove unused css classes from helper
controller tests for users