Add email validator

#186

config/application.rb

@@ -35,6 +35,7 @@ module Registry
     # Autoload all model subdirs
     config.autoload_paths += Dir[Rails.root.join('app', 'models', '**/')]
     config.autoload_paths << Rails.root.join('lib')
+    config.eager_load_paths << config.root.join('lib', 'validators')
 
     # Add the fonts path
     config.assets.paths << Rails.root.join('vendor', 'assets', 'fonts')

lib/validators/email_validator.rb

@@ -0,0 +1,15 @@
+class EmailValidator
+  def self.regexp
+    Devise::email_regexp
+  end
+
+  def initialize(email)
+    @email = email
+  end
+
+  def valid?
+    email =~ self.class.regexp
+  end
+
+  attr_reader :email
+end