Context manager

[liiight]

Added ability to use spinner as a context manager:

from pyspin import spin

with spin.Spinner(frames=spin.Box2, word='Now with context!):
    do_stuff()

Also added the option to pass some param to the Spinner class, probably could refacor so that make_spin will share some of the code

[liiight]

I guess this project isn't maintained anymore... shame 😞