AppNexusMeasures: Move RareCrowds data costs and legacy measure map out of public git
 * Add PersistentDictionaryJsonMeasureSource for dictionary stored legacy measure map
 * Move data costs and legacy map out of public git
 * Add script to upload directory structures to persistent dictionaries
Merge branch 'master' of https://github.com/RareCrowds/OpenAdStack into persistent-dictionary-measures
Merge branch 'master' of https://github.com/RareCrowds/OpenAdStack into persistent-dictionary-measures
AppNexus: Move data costs and legacy measure map to persistent dictionary
 * Replace EmbeddedResourceJsonMeasureSource with new PersistentDictionaryJsonMeasureSource
 * Remove datacosts CSVs and legacy measure map json from git
 * Add script to upload datacosts CSVs and legacy measure map from private config folder
 * Update unit tests expecting embedded legacy measure map