Log Message:
Update to 1.2.4

Changelog:
2013-03-27 Keith Winstein <mosh-devel@mit.edu>

        * Version 1.2.4 released.

        * New features:
                * Support port ranges with -p LOWPORT:HIGHPORT (Luke Mewburn)
                * Ctrl-^ Ctrl-Z suspends mosh client (Nikolai Zeldovich)
                * mm:ss display of lost-contact times (Kevin Ballard)
                * Show infobar with control chars when Ctrl-^ is typed
                * Put terminal in altscreen mode (Anders Kaseorg)
                * Tell automake/Debian pkg about our checks (Anders Kaseorg)

        * Platform support:
                * OS X: Script to build a universal package (Peter Iannucci)
                * FreeBSD: Fix build problems (Jimmy Olgeni)
                * AIX: port by Anton Lundin
                * Solaris with system curses (Anton Lundin)
                * Cygwin and others: eliminate use of IO::Pty (Anton Lundin)

        * Bug fixes:
                * Fix bug (introduced in 1.2.3) where server stays around
                  if process quits while client is detached
                * Clean up spurious entries from detached sessions warning
                * Fix freeze when connectivity is one-directional for hours
                  (reported by Axel Beckert)
                * Don't wipe title until a new one is set (sqweek)
                * Eliminate memory leaks and cppcheck warnings (Anders Kaseorg)