remove ORM support, Use ActiveRecord directly

Author: equivalent

lib/orm/active_record.rb

@@ -1,4 +1,4 @@
-require 'orm_adapter'
+require 'active_record'
 require "public_uid/version"
 require "public_uid/set_public_uid"
 require "public_uid/model"
@@ -8,4 +8,4 @@
 require "public_uid/generators/hex_string_secure_random"
 require 'public_uid/tasks' if defined?(Rails)
 
-require 'orm/active_record' if defined?(ActiveRecord::Base)
+ActiveRecord::Base.send(:include, PublicUid::Model)

lib/public_uid.rb

@@ -3,7 +3,7 @@ require 'rake'
 namespace :public_uid do
   desc "Generate public_uid on Models that have public_uid column on records that have nil value"
   task :generate => :environment do
-    Rails.application.eager_load!
+    Rails.application.eager_load! if defined?(Rails)
     ActiveRecord::Base.descendants.each do |model|
       model.connection # establish conection
 

lib/public_uid/tasks/generate.rake

@@ -18,11 +18,10 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "orm_adapter", "~> 0.5"
+  spec.add_dependency "activerecord", '> 4.2' # ensures compatibility for ruby 2.0.0+ to head
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "minitest", "~> 5"
   spec.add_development_dependency "rr", "~> 1.1.2"
-  spec.add_development_dependency "sqlite3"
-  spec.add_development_dependency "activerecord", '~> 4.2' # ensures compatibility for ruby 2.0.0+ to head
+  spec.add_development_dependency "sqlite3", "~> 1.4.1"
 end