Update site

-Fixes Proccessing examples
-Adds evaluzio.net
This add evaluzio and fixes link to geometryzen
Little  bug still left in repl.js
another repl bug fix that makes len({'a':1, 'b':2}) work
First steps to getting better slicing support.
Slicing seems to pretty much work as in CPython now (at least constructing and comparing slices).
Slice no longer converts its arguments to Javascript types.
Merge pull request #165 from albertjan/website-update

Website update & repl bugs
division where the denominator is a bigint, should respect the Sk.python3 config variable
Make parameter type definitions match what is needed.
Merge pull request #166 from jaspervdg/master

Improvements to slicing support
Properly return None.
Merge remote-tracking branch 'rixner/master'