Travis: Initiating build for commit '2a1c4c724fa902bcf84717d35e56f8fac2f1514b' on branch 'master': Merge pull request #6851 from piwik/cloudfront_and_iis_bugfix

Cloudfront log importing support (web + RTMP) and W3CExtendedFormat refactor (allow derived types to modify recognized fields and interpret time-taken as seconds by default).