upload files to s3 if s3 config is set
comment out s3 credentials
show nicer filenames in file list
cleaned up upload code

much more code reuse
changed file to savedFile for consistency
changed file to savedFile for consistency
Merge branch 's3' of github.com:tobobo/lets-chat into s3
move mime type check
don't break with files with spaces
Merge pull request #62 from tobobo/s3

Upload files to S3