Merge pull request #242 from sspinc/feature/unstruct-events-etl

ETL for unstructured events and properties
Typo in filename
Added JSON validation into the unstruct events' JSON processing; updated tests to check it works okay
Skip Uri validation for the time being, but make it configurable in the future
Added a lens to update the search term on a Referer object
Now fixing tabs and newlines in referer terms