Start v0.3.1 bugfix branch

Add "-dev" tag, increment micro version.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

configure.in

 AC_PREREQ(2.60)
-AC_INIT([openocd], [0.3.0],
+AC_INIT([openocd], [0.3.1-dev],
   [OpenOCD Mailing List <openocd-development@lists.berlios.de>])
 AC_CONFIG_SRCDIR([src/openocd.c])