Complete implementations of Python builtins

[freakboy3742]

batavia/core/builtins.js is an implementation of all the Python builtins - methods like print(), input(), list(), abs(), min() and so on.

An implementation of these builtins is required.

[schuyler1d]

i'm going to implement filter()

[jasonwalsh]

I'm going to work on reversed() 💥

[lisroach]

I will implement list()

[schuyler1d]

also doing map()

I'm going to work on len()

[raehart]

Going to work on this issue, is there any particular method that is needed ASAP? otherwise I'll pick one and post.

working on set()

[Lawlheart]

working on oct()

[Lawlheart]

working on all()

[raehart]

working on isinstance()