Kill trailing whitespace in ruby files

app/models/user_password_reset_nonce.rb

@@ -15,18 +15,18 @@ class UserPasswordResetNonce < ActiveRecord::Base
   def initialize_key
     self.key = SecureRandom.hex(16)
   end
-  
+
   def validate_existence_of_email
     if !User.with_email(email).exists?
       errors[:email] << "is invalid"
       return false
     end
   end
-  
+
   def reset_user!
     user.reset_password_and_deliver_notice
   end
-  
+
   def user
     @user ||= User.with_email(email).first
   end