Values >99 and ==0 are possible.

From MSDN: "A value of 0 clears the badge, values from 1-99 display as
given, and any value greater than 99 displays as 99+."
http://msdn.microsoft.com/en-us/library/windows/apps/br212849.aspx
Merge pull request #8 from spiegalpwns/master

Allow values >99 and equal to 0 in sendBadge.