xortool-xor is not python 3 compatible

[duanehutchins]

Traceback (most recent call last):
  File "/python/bin/xortool-xor", line 117, in <module>
    main()
  File "/python/bin/xortool-xor", line 51, in main
    sys.stdout.write(xor(datas, nocycle=nocycle))
  File "/python/bin/xortool-xor", line 66, in xor
    for i in xrange(maxlen):
NameError: name 'xrange' is not defined

xrange was replaced by range in Python 3

[duanehutchins]

added PR #23 to fix issue

[maage]

Also #26 fixes this issue.

[hellman]

Thanks, should be working now

[anthraxx]

@hellman would it be possible to actually cut a python3 release? It would be great as lot of distros are moving away from python2 and I would like to put this into the main repos.