[sup-talk] Need a simple check / nice error message for user error on mbox being a dir

[Andrei Thorp <garoth@gmail.com>]

Scanning mbox:/var/spool/mail/thought...
/usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/mbox.rb:155:in
`gets': Is a directory - /var/spool/mail/thought (Errno::EISDIR)
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/mbox.rb:155:in
`block in next_offset'
	from <internal:prelude>:10:in `synchronize'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/mbox.rb:152:in
`next_offset'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/mbox.rb:169:in
`first_new_message'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/mbox.rb:139:in `poll'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/poll.rb:155:in
`poll_from'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/lib/sup/util.rb:609:in
`method_missing'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/bin/sup-sync:123:in
`block in <top (required)>'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/bin/sup-sync:118:in `each'
	from /usr/lib/ruby/gems/1.9.1/gems/sup-0.12.1/bin/sup-sync:118:in
`<top (required)>'
	from /usr/bin/sup-sync:19:in `load'
	from /usr/bin/sup-sync:19:in `<main>'

Obviously a simple user error here. Would be nice if sup knew to throw
a nicer error here. Not a big deal!
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