Fix edit form.
correctly scoped translation key

Fixes #104

Conflicts:
	app/mailers/spree/user_mailer.rb
correctly scoped translation key

Fixes #104

Conflicts:
	app/mailers/spree/user_mailer.rb
add subject line and body specs for Spree::UserMailer

Fixes #106
Add default_url_options to user_mailer spec
Force Spree.user_class to be set to Spree::User to fix the infamous error:

rake aborted!
Association named 'spree_roles' was not found; perhaps you misspelled it?

It's tripped me up WAY too many times now.
Don't clear *all* the cookies and *all* the session when signing out
added named routes

Fixes #109
Fix setting logout flash message by simply letting devise handle destroy action.