Add Python 3 support

[ellmetha]

No description provided.

[rlskoeser]

Thanks for taking this on! We haven't really started looking into python 3 yet, unfortunately, and I haven't taken the time to look into it as I should. It looks like by using six and the changes you've made, the same code can be run on both python 2.6/2.7 and 3.x? (So great that Travis-CI can test all of those versions.)

Are there any caveats or concerns, things we need to pay attention to moving forward with these changes to make sure we maintain python 3 compatabilty?

[ellmetha]

Hi ;)

the same code can be run on both python 2.6/2.7 and 3.x? (So great that Travis-CI can test all of those versions.)

Yes. I made sure that the code can run under the following versions of Python : 2.6, 2.7, 3.3, 3.4 and 3.5.

Are there any caveats or concerns, things we need to pay attention to moving forward with these changes to make sure we maintain python 3 compatabilty?

Not necessarily if you're used to write Python 2-3 compatible code. As you noticed, the proposed changes make heavy use of six helpers. I also added tox to the project in order to ease testing against different versions of Python.

[coveralls]

Changes Unknown when pulling e832ae0 on erudit:python3-support into ** on emory-libraries:master**.