bump to 0.4.5
bump to 0.4.5

I don't bump the major version number since all that's happened since .4 has been refactoring and performance enhancements (in the guise of more error handling).

darcs-hash:20080722010542-f7719-b55053e87666e04ed0797d11d9ad9a8b79f630f9

gwern/mueval,bitemyapp/mueval