Fix mime-type method to get file type
Fix mime-type method to get file type

mime.contentType is used to generate a full content-type header from a partial type.
mime.lookup is used to get the content-type of files
https://github.com/jshttp/mime-types#mimelookuppath
MathieuLoutre/grunt-aws-s3,MathieuLoutre/grunt-aws-s3