  * use ObjectsCache to cache static files
  * make some template functions into classes to make them cache the template file
  * document how okasha is compared to django, Pylons, Sponge, Tornado, Turbogears, Turbogears 2, web.py, 
  Flask, Bottle
  * add a function argument ObjectsCache that skips adding to cache if True
  * implement fileSizeGreaterThan() and use it

