debug
speed up and concurency bug fix

Two BAD things were going on:

- Loading all the time caused huge delays. Using require instead
  and eager loading should solve that problem.
- Class @@variables are BAD. They are only one for all inherited
  classes and were causing chaos. Good that it is fixed. Class
  @instance variables (still on class level) are OK.

Signed-off-by: zeljko <zeljko@zwr.fi>