Fixed bug where it was not possible to use the sdist after the move
of source files and config files.
When pip tried to install the dist it tried to look after the config
folder but could not find it but python thought it was installed
but could not be uninstalled unless the project folder was renamed
and pip somehow lost because it could not find the path.
With this change pykwalify is not imported during setup and the
exception is not raised causing pykwalify to fail horribly.
Random install fix Oo
Added new experimental feature allowempty that can validate a map with
or withouth data in it. See README for more info and examples.