Log Message:
Update to aria2-0.16.2.  Notable changes:

- Added Serbian, Vietnamese, and Traditional Chinese translations.
  Updated French, Simplified Chinese, and Japanese Translations.

- Added length equality test to operator== to drop a piece message
  whose length does not match to the requested one.

- Fixed the bug that aria2 aborts when a request larger than 16KiB is
  recieved.  In this fix, if a request larger than 16KiB length is
  received, aria2 disconnects the peer.

- Updated man page. Changed doctype of aria2c.1.html to manpage in order
  not to replace '--' with em dash character.

- Added --auto-save-interval=SEC option. A control file(*.aria2) is saved
  every SEC seconds.

- Added --dht-file-path option to change the path to dht.dat, which is a
  serialized DHT routing table.

- Fixed the bug that last character in URI is not encoded.

- Fixed the bug that referer header field contains fragment.  Now Request
  class removes fragment part of URI and encodes it in Request::setUri()
  and setReferer().