specify release version numbers

update version to 3.1

update asm to 4.2
fix issue 39 (make things work with asm 4.1+), patch by Stuart McCulloch
fix issue 42 (fix dynamic lookup for traceclassvisitor), patch by Stuart McCulloch

remove debugging

fix build to point to asm-3.1.jar

jarjar-compatibility fix

version number was changed

prepared for 2.1.02 release

changed key type from class to string

prerelease

don't clear threadlocals after each new instance