Moves stopspam up a directory.

It's more consistent with other packages this way.
Removes an oddly placed __init__.py.
Restructures the package __init__.py

This follows the PEP 396 convention of versioning, putting it in a __version__
variable.

It also adds a better docstring so it's nicer with IPython.
Imports all from stopspam to restore import functionality.

Otherwise, you can't just do import stopspam; stopspam.check()
PEP 8 compatibility and uses new version code.