Clean up the conversion of unicode to ascii

The unicodedata package does a great job with a best representation of
unicode in ascii, so we can use this instead of struggling with specific
code page issues.
Do comparisons in unicode instead of ascii

Since we can easily display the differences in unicode in the browser it
is better to not convert to ascii to convert and just use the unicode
strings.
Merge pull request #7 from BenMPen/master

Cleaning up the comparison code to do xls comparisons in unicode.