Replace binary Tunnelblick.alfredworkflow with unpacked source files

The binary Tunnelblick.alfredworkflow is actually a zip file that should be versioned in source form. This makes it easier to make and version changes in the workflow configuration.

This is the (small) drawback that installable zip file of the workflow has to be created and hosted separately of github's automatic `master.zip` solution.

But I think a quick shell script to bundle it is worthwile.
