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.
Update deface to display login nav bar on backend

admin layout in spree/spree was broke into partials in
https://github.com/spree/spree/commit/032fea840560d67838ad7f8c300be44994027893

Fixes #112
Add more to gitignore.
Fix broken Spree::UserMailer
Cleanup the locale keys.

All locales already exists in spree_i18n so maintenance of diffenent
locales in this module also is not very DRY.
Cleanup migrations.
Update specs to use Capybara 2.

- Cleanup the specs.
- Add coverage reports.
- Capybara 2 changes.
- Fuubar make spec runs nice :)
- Add locale spec.
Updated license date.
Some code cleanup.
Updated Travis config.
Updated readme.
Nicer badge for Code Climate.
Updated readme.
Remove Versionfile.