The converter can now be chosen for the view, and more helpful 404s are thrown
Added Crockford's base32 converter
Added SHORTURLS_DEFAULT_CONVERTER setting so template tag converter can be specified
Perform doctest if run directly
Speed up from_decimal and to_decimal by a lot (third to 50%ish).
Merge pull request #8 from bfirsh/crockford-base32

Add Crockford's base32 and performance improvements