Identify and fix memory leak

[Andrew Horn]

Something is leaking memory - possible causes

• image generator
• user image server
• something heartbeat related
• bad db querying
• something that uses files

attempted fixes planned:

• manually calling the gc every so often
• ensuring all image and file objects get deleted proper

diagnostics that would be nice to look at:

• memory usage of uwsgi over a period of 72 hours
• page hit counts

if anybody has any other ideas to test, let me know