Replaced ntpath with os.path in cjsonwriter.
Replaced ntpath with os.path in cjsonwriter.

cclib/cclib,gaursagar/cclib,ATenderholt/cclib,berquist/cclib,berquist/cclib,ATenderholt/cclib,langner/cclib,cclib/cclib,cclib/cclib,berquist/cclib,gaursagar/cclib,langner/cclib,langner/cclib