[epic] MVP Data API next gen

[rufuspollock]

Tasks

• v0.1: New Read API (even running against old DataStore DB ...?) [epic] Read Service with CKAN v2 compatibility #1
• v0.2: Management API with new Data API storage and bridge
• v0.3: Management UI
• v0.4: embedding Explorer using new API in a Dataset page

Absolute min MVP that delivers most immediate value

• Absolutely basic read API service [epic] Read Service with CKAN v2 compatibility #1
  • Backwards compatible API
  • Formats: CSV, XLXS etc
• Explorer refactored -- may not be needed if we have backwards compatible API