humpy.hump: Do not export anything by default

The entry point of the package is the #@ reader macro, the helper
functions should not be exported.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
humpy.hump: Fold the helpers into the reader macro

To make things a little simpler (for some values of simpler), fold the
helper functions into the reader macro.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
humpy.hump: Rewritten to work with Hy master & Python3

When using python3 and Hy master (as opposed to 0.10.0), a few functions
return iterators instead of lists. The new code works with both.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>