Bump version from 0.6.3 to 0.7.0.dev0 in docs and .yaml

[pcmoritz]

What do these changes do?

Related issue number

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[robertnishihara]

@pcmoritz the URL that you use in this PR does not work. I'm a bit confused.

There are three different names.

1. 0.7.0dev0 (this is the name you use in this PR).
2. 0.7.0dev (this is the version string in __init__.py).
3. 0.7.0.dev0 (this is the name of the wheels in the S3 bucket.).

Any idea what's going on here?

[pcmoritz]

Interesting, I'm seeing this warning during in the linux wheel travis entry:

/opt/python/cp27-cp27mu/lib/python2.7/site-packages/setuptools/dist.py:388: UserWarning: Normalizing '0.7.0dev' to '0.7.0.dev0'

So it looks like we need to use 0.7.0.dev0. I'll change it.

[pcmoritz]

Ok I updated it, good catch. Now downloading the wheels seems to work!

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