update activerecord to 4.0 release
update activerecord to 4.0 release

victor95pc/enumerize,monfresh/enumerize,quarkstudio/enumerize,brainspec/enumerize,maurogeorge/enumerize,tanraya/enumerize,shaundunne/enumerize,hungrything/enumerize,tranvictor/enumerize