Simple PyPi Caching Proxy

Now that PyPi is being accelerated by the Fastly caching network, pip/easy_install already are running faster. However, this can be taken a step further by setting up a simple caching proxy. By caching packages locally (on the machine or in your private network), you don’t have to keep hitting Fastly/PyPi to download them. This is especially useful if you are constantly running builds and/or tests: AKA continuous integration.