Master brand mapping

Include master brands not already in ION services map.
Remove duplicate mapping
Add new alias writer to write BBC MasterBrand IDs onto channels as Aliases
Moved bbc_alba channel from masterBrands map to services map for Nitro ingest
Add in service uris for new channels added to represent the MasterBrands for BBC News and BBC Sport
Merge pull request #599 from atlasapi/bbc-master-brands

Include missing BBC master brands in services map