Adding migration to rename /housing/... to /housing-local-services/...

Renaming the tag 'housing' to 'housing-local-services' so 'housing' can be reused as a topic.
removing the bang so the script won't stop on a fail
Merge pull request #222 from alphagov/renaming_browse_housing_section

Adding migration to rename 'housing'... to 'housing-local-services'...