fix user password field to not accidentally re-encrypt itself on save

currently this is flagged manually in one place, but there's no reason not to
let the user model handle it. this way, you can update your user model from a
console or some other area without accidentally changing your password.

app/controllers/users_controller.rb

@@ -29,10 +29,8 @@ class UsersController < ApplicationController
 
     if user
       user.skip_user_id_assign = true
-      user.skip_hash_password = true
       user.update_attributes(user_params_without_password)
-      if !(params[:user][:password].empty?) && (params[:user][:password] == params[:user][:password_confirmation])
-        user.skip_hash_password = false
+      if params[:user][:password].present? && (params[:user][:password] == params[:user][:password_confirmation])
         user.password = params[:user][:password]
       end
       message = true if user.save!