Adding a LegacyApi output for a show - outputting XML as e.g.
http://localhost:8000/app_dev.php/legacyapi/show/152 or http://localhost:8000/app_dev.php/legacyapi/show/as-you-like-it

to match the old

http://www.camdram.net/showdata.php?type=xml&showid=2
More changes to support legacy API. Now uses urls like
http://localhost:8000/app_dev.php/legacyapi/show/id/152
or
http://localhost:8000/app_dev.php/legacyapi/show/slug/as-you-like-it
to cope with numeric slugs for e.g. 1984 !