Salts should be randomized on install

As part of setup, the Cake salts should be randomized.

/**

• A random string used in security hashing methods.
  */
  Configure::write('Security.salt', 'RANDOMIZETHIS');

/**

• A random numeric string (digits only) used to encrypt/decrypt strings.
  */
  Configure::write('Security.cipherSeed', 'RANDOMIZETHISTOO');