Fix Py2Exe / Py2App
Fix Py2Exe / Py2App

Fixes the C PoW loading in frozen apps (Windows and OSX)
Cleaner fallback in PoW if something goes wrong

mailchuck/PyBitmessage,mailchuck/PyBitmessage,lightrabbit/PyBitmessage,mailchuck/PyBitmessage,lightrabbit/PyBitmessage,Atheros1/PyBitmessage,Atheros1/PyBitmessage,Atheros1/PyBitmessage,lightrabbit/PyBitmessage,Atheros1/PyBitmessage,lightrabbit/PyBitmessage,mailchuck/PyBitmessage