Add command to show jira comments for ticket

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Update muttrc index page

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Add youcompleteme vundle

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Update jira-show command

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>