investigate possibility of caching directory list

[shellderp]

instead of walking the entire project structure when searching for keywords, we should cache the list of robot files in the project and update on file system changes

this should give us a big speed up since we spend a lot of time iterating through project files to find potential robot files

[shellderp]

potentially use http://pythonhosted.org/watchdog/

[shellderp]

• first goal: to simply cache the file list and ignore file updates
• second goal: experiment with watchdog
• final goal: implement watchdog in caching the file list