Sls Filename Cant Contain Period

The initial implementation of :conf_master:`top.sls <state_top>` and
:ref:`include-declaration` followed the python import model where a slash
is represented as a period.  This means that a SLS file with a period in
the name ( besides the suffix period) can not be referenced.  For example,
webserver_1.0.sls is not referenceable because webserver_1.0 would refer
to the directory/file webserver_1/0.sls

The same applies for any subdirectories, this is especially 'tricky' when
git repos are created.  Another command that typically can't render its
output is ```state.show_sls``` of a file in a path that contains a dot.