Merge pull request #66 from matsu911/master

Fix content-type problem
Bump up version to 1.6.8
Fix Digest::Digest deprecation warn on Ruby 2.1.0
Fix bug #38
Add security note about storing s3_website.yml
Updated the mime-types dependency
Merge branch 'master' of github.com:cpetersen/s3_website into cpetersen-master
Bump up version
Encode file paths before sending them to CloudFront
convert encoding of file path from utf8-mac to utf-8