Changes in the last month

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Hi

A few changes.

First, we have moved to github! (see previous post)
Second, we have dropped visual studio 2012 (sorry for the persons impacted).
Last, when building third_party, which you will need to do when switching to github,
you will need to install cmake on unix (linux and mac os X). See the documentation here:

  https://developers.google.com/optimization/installing

I have not yet adjusted the third_party building process on windows, but this will happen soon.

Thanks

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