issue 10 - Expand external-db.json to cover more scenarios.
- Added subscription parser and sample data with different options (always/bookmark)
- Added sample records for different approval status.
Fixes done for update documents in dev mode with external-db.json without check for document check
Merge pull request #20 from senthil-nz/master

Expand external-db.json to cover more scenarios. Fixes #10.