uncompresed (memstore) BED parser have a faulty +1 at the end of segments

[max-l]

I load a compressed BED (.bb), the exons display correctly if I load the same bed uncompressed, the exons have a length of + 1

the uncompressed track is loaded with :

          {name: "my bed track",
           uri: xyz.bed',
           tier_type: 'memstore',
            stylesheet_uri: "https://www.biodalliance.org/stylesheets/gencode.xml",
            payload: 'bed',
            collapseSuperGroups: true
          }

[dasmoth]

Fixed by #224