Basic maven support and custom classloader support for kilim when using asm 4.1

A pull request to add custom classloader support to the asm ClassWriter by providing a sub class in kilim.

I got this exact error in my code when upgrading to the stackmap branch of kilim.

http://stackoverflow.com/questions/11292701/error-while-instrumenting-class-files-asm-classwriter-getcommonsuperclass

I managed to resolve this issue with the pull request.  
This PR also includes basic maven support by wrapping the ant build script.