reminder comment: need to disable C-API mapping for dict.keys/values/items() in -3 mode to let them return a dict view in Py3

major refactoring of builtin method/function overrides to support explicit function types and utility code dependencies

fix 'self' argument type in generic builtin method overrides, test for None at call time (ticket #571)

--HG--
rename : Cython/Compiler/Dependencies.py => Cython/Build/Dependencies.py

Fill class attributes dict before class creation. Use bindings for class methods.
And use PyCFunction for staticmethods and __new__. Add simple testcase for __metaclass__.
And test for staticmethod as decorator