Add some primitives.
Add some primitives.

Relevant to issue #46.

pycket/pycket,krono/pycket,magnusmorton/pycket,magnusmorton/pycket,cderici/pycket,cderici/pycket,krono/pycket,pycket/pycket,vishesh/pycket,vishesh/pycket,samth/pycket,cderici/pycket,samth/pycket,vishesh/pycket,magnusmorton/pycket,krono/pycket,samth/pycket,pycket/pycket