Created originally on Bitbucket by hadalin (Primoz Hadalin)
Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.
Raise InvalidFileException when file invalid excel file
This change causes backward incompatibility for 'load_workbook' method. Before this change three different exceptions could be raised (InvalidFileException, BadZipfile and IOError), but now only InvalidFileException is raised.