Make the python dependency more lenient

[petemounce]

Based on this comment, allow python3 to be used. cc @meteorcloudy.

[bazel-io]

Can one of the admins verify this patch?

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[meteorcloudy]

Can we change the id to python only?

[petemounce]

Yes; excellent point! Done in 2a147e5.

[meteorcloudy]

LGTM, thanks!

[petemounce]

Cool. I'll publish 0.4.1 RCs built from this, unless you can think of a reason not to.

[petemounce]

Couple more changes to the chocolatey build/test scripts incoming.

[petemounce]

@meteorcloudy Please take another look?

[ferventcoder]

@petemounce this is effectively the same as version="2.7.11" - it just means 2.7.11 is the minimum version that can be installed.