Implement User show action
Change BCrypt's cost factor to minimal in test enviro
Implement user Gravatar
Fix typo
Style Gravatar/user name sidebar
Add signup form
Style signup form
Corrected mistaken placement of header outside div
Implement error messages for invalid signup
Move it block into proper describe block

Previously, `it "should create a user" do ... end` was incorrectly placed
outside of its proper `describe "signup" do ... end` block.
Implement successful valid signup
Implement successful-signup flash
Merge branch 'sign-up'

Conflicts:
	app/views/layouts/application.html.erb