[pypy-dev] Ootypesystem based genjs (genjs2)

[Maciek Fijalkowski]

I've added what I've done in last week with genjs, altough I'm not very 
happy with some issues.

- LoopFinder does not find nested whiles (I think it's also gensquek 
problem)
- Inheritance is not implemented
- Dict support is not implemented
- There is some code redundancy, because of copying from gencli. I hope 
to refactor it with antonio at DDorf sprint.
- I don't like builtin method and function mapping solution, especially 
copying whole misc.js at the beginning of source file. Some function 
should be copied on higher, some on lower level.