aria2 1.15.1 released

aria2 is a lightweight multi-protocol & multi-source, cross
platform download utility operated in command-line. It supports
HTTP/HTTPS, FTP, BitTorrent and Metalink.

This release fixes the bug that prevents --bt-lpd-interface from
working. If some options sent by RPC request are not acceptable for
the download type, they are now simply ignored instead of rejecting
RPC request entirely. The aria2 RPC server now returns 4XX error code
if the request is not valid in the HTTP level. To improve packaging,
--with-bashcompletiondir configure option was added. This option
overrides where the aria2c bash_completion file is going to be
installed. All manual pages are now generated by Sphinx.