Add AWS Cloudfront Support

[beautycounterops]

Hello, It would be useful to have support for Amazon's Cloudfront Logs. I have included AWStats configs for each, in hopes that this utility will adopt the log format.
S3:
LogFormat="%other %extra1 %time1 %host %logname %other %method %url %otherquot %code %extra2 %bytesd %other %extra3 %extra4 %refererquot %uaquot %other"
Cloudfront:
LogFormat="%time2 %cluster %bytesd %host %method %virtualname %url %code %referer %ua %query"

[MrMarvin]

Coming from this article, @quezacoatl provides a complete format file in his gist: https://gist.github.com/quezacoatl/bbc8195d44e8a0817b90c9e01ce43fc9

Just used them on our CloudFront logs. Works like a charm! Thanks @quezacoatl