fixed bug #298

enchant.Sprite : frame property assignment fails when using both array
based frame definition and normal frame defintion #298

Tests #sprite frame issue 298 -
https://github.com/wise9/enchant.js/issues/298
  1) frameArray -> frame (number)
  2) frameArray <- frame (number)

OK
Merge pull request #302 from illfang/spriteFrameArrayFix

fixed bug #298