Merge pull request #1075 from tweise/hds

Cleanup.
Merge pull request #1079 from tweise/hds

Create separate package, fix warning and other basic issues.
Adding JSON AdInfo generator and JSON converter operators; Integrating new operators into generic app
Merge pull request #1080 from sashadt/hds

Adding JSON AdInfo generator and JSON converter operators; Integrating n...
Fix DAG validation.