PRD-4988 - Ensured that XSSF colors are generated correctly with Alpha information so that Excel does not complain. Defaulted cell-format to default format "0" instead of undefined -1. Excel 2007 will still break if reports use number formats that are invalid for Excel.
Merge pull request #486 from tmorgner/PRD-4988-2

PRD-4988 - Ensured that XSSF colors are generated correctly with Alpha i...