Specify a fallback rule for GovStore's /cloudstore/supplier/* paths
Add more complicated fallback rules for GovStore service ID URLs

- These deal with:
    /cloudstore/service-id,
    /cloudstore/category/service-id,
    /cloudstore/category/sub-category/service-id and
    /cloudstore/category/sub-category/sub-sub-category/service-id.
Merge pull request #96 from alphagov/govstore_fallback_rules

Fallback rules for GovStore/Digital Marketplace paths