Bug in find conditional for tests/pyo/pyc deletion #212

The find command here aims to delete unwanted files:

However the inner conditionals used are of form:
-type d -a -name test -o -name tests
and
-type f -a -name '*.pyc' -o -name '*.pyo'

And the find man page says:

Please note that -a when specified implicitly (for example by two tests appearing without an
explicit operator between them) or explicitly has higher precedence than -o. This means that
find . -name afile -o -name bfile -print will never print afile.

...therefore they are interpreted like:
(-type d -a -name test) -o -name tests
and
(-type f -a -name '*.pyc') -o -name '*.pyo'

...which is presumably not what was intended.

I'll open a PR.