update to utcIntToTime

[agentfitz]

Hey man, thanks for this nice component. on CF10, I couldn't get utcIntToTime to work because cf did not recognize the datetime return time (expected date instead).

Also, made an adjustment to how the time was calculated based on this thread: http://stackoverflow.com/questions/13209751/how-to-format-stripe-timestamp-in-coldfusion

That worked well for me...