Concurrency Fixup/Web Interface/Controlled Buffering

General: Another Change to connection pooling/concurrency limitations.
SFTP: Stats Web Interface (json). http://127.0.0.138080/stats.json
SFTP: Adds check to prevent buffering too much in memory if the speed from
      client -> SwFTP is greater than SwFTP -> Swift
FTP: Stats Web Interface (json). http://127.0.0.1:38081/stats.json
Swift: Some cleanup in the swift-related code