Added initial versions of scripts to find/migrate aliases to the new format.
 - alias_mapping.js looks at all _ids, uris and aliases, and attempts to match to one of a series of regexes. If no match, then it prints it. Handy for finding unmapped aliases.
 - full_alias_mapping.js uses a similar regex --> alias mapping to convert existing aliases to the new namespace/value and write those back
Readded incorrectly removed loop iterating over existing ids
intial version of namespace/value aliases, with no simple model and minimal modification of existing code
Merge pull request #223 from atlasapi/mbst-4008-atlas-aliases

atlas aliases