Refactor the package

[glemaitre]

Hi,

I would go for a long run and refactor the package such that it follows more the scikit-learn template.
What I mean by that is something like this.

I propose to add the following support:

• sphinx/numpy doc.
• proper testing.
• continuous integration via Travis. If somebody wants to do the AppVeyor, that could be nice but I don't have interest in that.
• refactor the package into modules.
• proper coverage.

The full package will actually benefit from it. On the user side with a proper documentation. On the developer side to ensure back compatibility.

I will probably open a pull-request for that. It might be taking a while, but if anybody wants to jump in, I would be happy.

[fmfn]

I really like the idea. As the package gets used more and more some of its bugs are surfacing and proper testing and documentation would go a long way in fixing that.

[glemaitre]

@fmfn Could you create a branch gh-pages. I can make the pull request of the documentation branch there : http://glemaitre.github.io/UnbalancedDataset/

The page needs some improvements but this is a start

[fmfn]

There you go:

https://github.com/fmfn/UnbalancedDataset/tree/gh-pages

[glemaitre]

Adressed in PR #62