Update jquery.jSprite.js

Modified getSize, to detect the width and height if the value is zero.
Included getGrid, to detect the columns and lines if the value is zero.
Update index.html

Test auto size and auto grid
Update jquery.jSprite.js

Correção image load
Update jquery.jSprite.js

Remoção console
Merge pull request #17 from fpupor/master

Automatização dos options