Cache get_project

[stsewd]

This little one is being executed several times in several views.

[ericholscher]

Simple enough. Let's make sure to have a QA item to ensure this actually reduces those calls.

[stsewd]

Simple enough. Let's make sure to have a QA item to ensure this actually reduces those calls.

I tested this locally while refactoring some views in .com, it reduces 7 queries in the new sharing views. But this one is also called multiple times on the same views on .org https://github.com/readthedocs/readthedocs.org/blob/master/readthedocs/projects/views/private.py. Not sure if we can test that in production (no django toolbar), other than looking at newrelic I guess.