installing multiple python package versions

[Nikolai Lifanov]

Hello.

Amazon released AWS cli 1.0.0 (no longer a developer preview), and I was 
trying to submit a PR that updates devel/awscli.

However, I'm a bit stumped. It really, really wants py-requests 1.2.0, 
and the version in ports is 1.2.3. Is there a way to ween it off of 
1.2.0 or install both?

Here is a WIP patch so far.

Thanks!

- Nikolai Lifanov
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