Python 3 + Mixbox Support

[gtback]

This obsoletes #228 and incorporates mixbox, with the common "binding utils" delegated to that package. Mixbox natively supports Python 3, and this branch has also been updated to support Python 3.2, 3.3, and 3.4.

This requires mixbox 0.0.2. I didn't explicitly specify a version, since I don't want to remember to bump it each time in several places. If you have a different version of mixbox cached locally with pip, you can just "pip install mixbox==0.0.2" from any virtualenv to download and cache the newest version, which will get used to build new venvs.

[landscape-bot]

Repository health increased by 0.03% when pulling 9210af1 on mixbox-rebased into 85bc959 on master.

• 3 new problems were found (including 0 errors and 3 code smells).
• 5 problems were fixed (including 0 errors and 5 code smells).

[gtback]

@bworrell, I know this is a huge change, but do you have time to look at it and provide any feedback?

[bworrell]

What's this for?

[gtback]

I think it is a find-replace gone bad. It pops up in a couple spots. I fixed it in 8327de6.

[bworrell]

@gtback, I looked through the code and posted a few comments/questions but overall I think it looks awesome!

I ran nosetests against my local python-stix clone and it failed because ExternalEncoding no longer lives in cybox.bindings. If I add the following line to __init__.py in cybox.bindings, everything passes:

# For python-stix/python-maec
from mixbox.binding_utils import ExternalEncoding

I'm not sure if we want to add the line, or just work towards getting python-stix|maec up and running with mixbox before pushing out a new release of python-cybox. What do you think?

[gtback]

I would lean towards not adding to cybox.bindings.__init__, since the python-stix|maec code doesn't actually do what it's supposed to after that change (it redefines cybox.bindings.ExternalEncoding, but that doesn't actually modify mixbox.binding_utils.ExternalEncoding which is what the CybOX bindings use for output). Better to just update python-stix|maec quickly. I don't see an immediate need for a python-cybox release.

[landscape-bot]

Repository health increased by 0.03% when pulling 603f7a9 on mixbox-rebased into 85bc959 on master.

• 3 new problems were found (including 0 errors and 3 code smells).
• 5 problems were fixed (including 0 errors and 5 code smells).

[bworrell]

@gtback, this looks awesome! I'm gonna merge, though we'll need to update python-stix and python-maec before the next release. Thanks!!