New mumi www and mumi compose subcommands

[Arun Isaac]

Hi all,

The latest mumi CLI (version 0.1.0) comes with two new
subcommands—www and compose.

Now, when an issue is current, you can open that issue in your web
browser using the www subcommand; and, you can compose a mail to that
issue using the compose subcommand.

For example,

$ mumi current 22138
#22138 Search paths of dependencies are not honored
opened on 10 Dec 2015 09:36 by Ludovic Courtès

$ mumi www
[opens the issue in your web browser]

$ mumi compose
[opens your mail client to compose an email to that issue with addresses
pre-filled correctly]

The www and compose subcommands rely on xdg-open to open your browser
and mail client correctly.

Cheers!
Arun