Add Blackburn and Greenwich (acolnet sites - patch from Peter Collingbourne.
Fixes to Ocella parser (also from Peter). Adds Bridgend, Castle Point, Great Yarmouth, Havering).
Fix typo and escaping in getinvolved (patch from David Sheldon).

We already have scrapers for Islington and East Herts, but I'm adding the new ones as well - we can then see if we 
get the same results :-)