Revert "reverted back to previous require 'crypt/ISAAC' (require 'crypt-isaac' doesn't work for me)"
Revert "reverted back to previous require 'crypt/ISAAC' (require 'crypt-isaac' doesn't work for me)"

This reverts commit c77a0989fa02353bfe8136a1b60b6f262396926c.

adamdruppe/rubycas-server,DiegoSalazar/ROR-RubyCAS-Server,infoman/rubycas-server,chowells79/rubycas-server,adamdruppe/rubycas-server,Windermere/rubycas-server,rubycas/rubycas-server,rubycas/rubycas-server,acsellers/cas,Windermere/rubycas-server,rubycas/rubycas-server,geo767/rubycas-server,identification-io/rubycas-server,infoman/rubycas-server,chowells79/rubycas-server,acsellers/cas,jay3126/ruby_cas_server,DiegoSalazar/ROR-RubyCAS-Server,Windermere/rubycas-server,adamdruppe/rubycas-server,jay3126/ruby_cas_server,geo767/rubycas-server,identification-io/rubycas-server,intinno/ruby-cas-server,infoman/rubycas-server,geo767/rubycas-server,intinno/ruby-cas-server,identification-io/rubycas-server,chowells79/rubycas-server