New cabinet office mappings
Launch mappings number10
Merge branch 'master' of git://github.com/alphagov/redirector into newmappings

Conflicts:
	data/mappings/number10.csv
Number10 launch mappings
Manual resolution of 418
Merge pull request #183 from rjc123/newmappings

Launch mappings for no10, some latebreaking cabinet office.