Fixed rounding error with integer math that did not calculate the number
of rows correctly.
Fixed url and image name.
Fixed image name for realz this time
Modified script to create two separate image sheets with different
scales along with a single CSS file that has all unnecessary whitespace
removed.
Removed another whitespace character in the generated CSS file
Created a simple object to store image sheet properties
Fixed media width attributes
Merge pull request #18 from cherylcourt/master

Fixed rounding error with integer math