Make GAM pip installable

[jay0lee]

It should be possible to install GAM via pip. This does not replace the binary installation scripts but does offer a simple install for users who already have Python 2.7 and pip on their system.

First step is to complete #719 but once that's done the process should be pretty straightforward:

https://packaging.python.org/tutorials/distributing-packages/

[scrthq]

Hey @jay0lee - I know this is pretty old, but this would be beneficial to have in order to easily integrate with FaaS like AWS Lambda, e.g. to provide a controllable, least-permissive API interface for G Suite management / automation. Is this still a goal? Assuming so considering this issue is still open, but I didn't want to dive in if it's not something worthwhile/stale.

[LewisLebentz]

Would be super useful for FaaS, unfortunately I don't have the knowledge to create a PR to help.

It's the one thing that would fully unlock GAMs potential for us, helping with automation and delegating out controls that aren't possible via admin roles.