Updated Digit Parser

[robertabramski]

The digit parser doesn't work with numbers formatted with a comma. Added regex to remove the comma for formatting.

[Mottie]

This change is not a good idea... some countries use the comma and decimal point the opposite of how it is used in the U.S. (e.g. € 2.156,33 or € 2 324 156,33); pull request #34 is a better idea.