make vembyr work with py3

[kazzmir]

update various py2-isms in vembyr. The tests pass now

~/svn/paintown/src/mugen/parser/vembyr $ ./test_peg.py 
[test1] Test bnf..
[test1] Test python..
[test1] Test c++..
[test2] Test bnf..
[test2] Test python..
[test2] Test c++..
[test3] Test c++..
[test4] Test c++..
[test4] Test python..
[test5] Test bnf..
[test5] Test python..
[test5] Test c++..
[test6] Test bnf..
[test6] Test python..
[test6] Test c++..
[test7] Test c++..

Tests run 7. Failures 0
Performance test 1
Total 0.050692. Single run 0.050692
Performance test 2
Total 0.114882. Single run 0.057441
Performance test 3
Total 0.148437. Single run 0.049479