Initial commit, differences in ImportLogsTest.
Adding support for parsing amazon cloudfront log files in log importer & making W3cExtendedFormat treat time-taken field as seconds by default (since that is what the W3C format specifies). Also add support for event tracking and cloudfront RTMP logs (which provide event logs). Also allow multiple spaces in between W3C extended log files. Allow derived classes of W3cExtendedFormat to define new custom field regexes.
Fixing build for merge and move IIS check for --w3c-time-taken-milli to Parser.check_format so only one warning outputted.
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).