Fix the wxpython check in setup.py
Fix the wxpython check in setup.py

The correct import statement for wxpython is 'import wx' not
'import wxpython'.

bendmorris/retriever,embaldridge/retriever,goelakash/retriever,bendmorris/retriever,davharris/retriever,davharris/retriever,henrykironde/deletedret,embaldridge/retriever,embaldridge/retriever,davharris/retriever,henrykironde/deletedret,bendmorris/retriever,goelakash/retriever