add minimal support for exception

try:
    raise SomeObjectThat
except:
    print __exception__  # special variable that holds the raised exception for further inspection
clean up
support For loop with iterators
draft builtins with list class
no need to cat python.js...
support booleans
lists it probably works
...
quick implementation of dict
fixes
add missing var which fixed a bug with infinite recursion while creating objects
foo.bar = baz() works
foo.bar = JSArray() works
moar var
bugfix for loop
fix forloop
separate print values by commas
fix «if not foo»
probably fixed forloop
fix get_attribute with inheritance