startup time

[stuckyb]

Currently, OntoPilot is relatively slow to start up. It would be good to investigate ways to improve this. Options include:

1. Optimizing import statements so that modules are only imported when needed (but be careful of repeated imports (e.g., inside functions), which could degrade performance).
2. Using something like Nailgun might also be an option (http://martiansoftware.com/nailgun/).