Bug/fix enummeta comparisons

[ryanmrubin]

EnumMeta comparisons were failing in Python 3 because they relied on __cmp__, which is no longer present (and neither is the builtin cmp().

This adds __lt__, __eq__, and the functools.total_ordering decorator to the EnumMeta class for Python 3 purposes.

cmp is left in for python 2.

GLOB sdist-make: /Users/rrubin/projects/duo/setup.py
py27 inst-nodeps: /Users/rrubin/projects/duo/.tox/dist/duo-0.3.1.zip
py27 installed: boto==2.43.0,coverage==4.2,duo==0.3.1,funcsigs==1.0.2,mock==2.0.0,nose==1.3.7,pbr==1.10.0,six==1.10.0
py27 runtests: PYTHONHASHSEED='1470742131'
py27 runtests: commands[0] | nosetests --with-coverage --cover-package=duo
............
Name     Stmts   Miss  Cover
----------------------------
duo.py     338    104    69%
----------------------------------------------------------------------
Ran 12 tests in 0.141s

OK
py35 inst-nodeps: /Users/rrubin/projects/duo/.tox/dist/duo-0.3.1.zip
py35 installed: boto==2.43.0,coverage==4.2,duo==0.3.1,mock==2.0.0,nose==1.3.7,pbr==1.10.0,six==1.10.0
py35 runtests: PYTHONHASHSEED='1470742131'
py35 runtests: commands[0] | nosetests --with-coverage --cover-package=duo
............
Name     Stmts   Miss  Cover
----------------------------
duo.py     338    102    70%
----------------------------------------------------------------------
Ran 12 tests in 0.175s

OK
______________________________________________________________________ summary _______________________________________________________________________
  py27: commands succeeded
  py35: commands succeeded
  congratulations :)

[coveralls]

Coverage decreased (-0.6%) to 60.234% when pulling aa5f29b on ryanmrubin:bug/fix-enummeta-comparisons into 4d8305a on eykd:master.

[coveralls]

Coverage decreased (-0.6%) to 60.234% when pulling aa5f29b on ryanmrubin:bug/fix-enummeta-comparisons into 4d8305a on eykd:master.

[coveralls]

Coverage decreased (-0.2%) to 60.651% when pulling 6a8f3df on ryanmrubin:bug/fix-enummeta-comparisons into 4d8305a on eykd:master.

[coveralls]

Coverage increased (+1.4%) to 62.281% when pulling fedd738 on ryanmrubin:bug/fix-enummeta-comparisons into 4d8305a on eykd:master.

[eykd]

👍