fix on segment fault on 64 bit system. (callable Python object as restype not works since it assume return a integer (32 bit)
add wapiti and libwapiti source
build wapiti as extension
add missing __init__.py
add cflags and linker args; remove pywapiti package
Merge pull request #1 from tpeng/master

fix crash on 64 bit system. (testing on MacOS)