Travis: Initiating build for commit '484ff277c922d496e866dc202de4f8f6b6b189cb' on branch 'master': Merge pull request #6066 from piwik/json2_api_format

Move JSON format bug fixes to new JSON2 format so existing clients will not fail. Adds deprecation note for JSON format and uses JSON2 in future proof code (angularjs/log importer).