detab
provide a (automatic) conversion to rdf. fixes #9

Test like this:
    $ rapper -i grddl -o turtle http://example.com/stations/b1/2013/03/02/1505%20Heute%20im%20Stadion.xml
provide a (automatic) conversion to rdf. fixes #9

Test like this:
    $ rapper -i grddl -o turtle http://example.com/stations/b1/2013/03/02/1505%20Heute%20im%20Stadion.xml
grrr. fixes #9
tweak http caching
replace superseded broadcasts. fixes #7