Refactored out the create vaults method to the Utils class, created a
method that loops and times account decryption
Utils.createVault() returns the new vault

instead of always returning null;
Abandoning idea of testing the device speed

My meager and simple testing suggests that there is too much time
variance in calculating the key with the same number of iterations due
to the devices clocking down and up
Erased all traces of the DetectSpeed Fragment