Use namespace package declaration of zope.interface
Fix install_requires in setup.py
Rename package cbpos.mod to cbmod
Replace occurences of cbpos.mod with cbmod in the code
Update LICENSE to MIT License
Update setup.py to uniform template and bump version to 0.2
Lower PySide requirement to 1.0 because 1.1 is still newest in many distros
Filter by currency ID instead of symbol to get a unique currency