Create user partial
Render user partial in new and edit templates
Add headings in show template
Add require login before filters for editing and destroy
Add placeholders in form to fix errors
Add sessions resources
Add url aliases for login and logout
Add login and logout links to app layout
Edit session path in login form
Fix delete session link in layout template
Skip require login before filter for #edit, #update, and #destroy tests
Generate sessions controller spec and test #new
Add #new and #create
Create #destroy action
Added empty #create and #destroy tests to return to later