Add www.ceh.ac.uk to whitelist for EA

54 Environment Agency mappings, almost all for /hiflows* paths,
redirect to http://www.ceh.ac.uk/data/nrfa/peakflow_overview.html
Remove trailing space
Merge pull request #59 from alphagov/add_ceh_to_whitelist_for_ea_hiflows

Add www.ceh.ac.uk to whitelist for EA