 0.01  2017-08-08

       Start on initial version

 0.02  2017-08-08 - 2017-09-02

       Improve POD
         - Typos
         - Add head1 for Source Code


       A grid minimally consists of one vertical and one
       horizontal line

       Adding tracks returns also the newly created line.

       $track->area($line_from, $line_to);

       Makefile.PL
        - She bang
        - chmod 755

       t/01-load.t: isa_ok();

       Use MANIFEST.SKIP rather than ignore.txt
