Change default dB Engine from MyISAM to InnoDB

I have long ago converted my production zoneminder dB tables to InnoDB and have not experienced any side effects.  One benefit of using InnoDB is a significantly lesser chance of table corruption after an unclean shutdown.  Thoughts?
Merge pull request #77 from knnniggett/patch-2

Change default dB Engine from MyISAM to InnoDB