Misc renames for otp secret key.

lib/two_factor_authentication.rb

@@ -1,13 +1,12 @@
 require 'two_factor_authentication/version'
-require 'randexp'
 require 'devise'
-require 'digest'
 require 'active_support/concern'
+require "active_model"
+require "active_support/core_ext/class/attribute_accessors"
+require "cgi"
+require "rotp"
 
 module Devise
-  mattr_accessor :login_code_random_pattern
-  @@login_code_random_pattern = /\w+/
-
   mattr_accessor :max_login_attempts
   @@max_login_attempts = 3
 end

lib/two_factor_authentication/schema.rb

@@ -1,7 +1,7 @@
 module TwoFactorAuthentication
   module Schema
-    def second_factor_pass_code
+    def otp_secret_key
-      apply_devise_schema :second_factor_pass_code, String, :limit => 32
+      apply_devise_schema :otp_secret_key, String
     end
 
     def second_factor_attempts_count