-Added Ange Albertini's patch to provide more helpful error messages when pefile meets NE/LE/LX files and ZM (as opposed to MZ) files. The PEFormatError() exception raised will inform about the type of file.

git-svn-id: http://pefile.googlecode.com/svn/trunk@98 8842bc4e-7134-0410-8230-5dc5194fb5c1