Added integration with check.
added listener example
removed -g from Makefile.am's CFLAGS var.
hide frame internals from stomp.c

This also fixes the pointer handling within the frame after a realloc()
call. The addition of frame::stomp_hdrs is a bit ugly, but works for
now.
Removed references to stomp-utils
Removed STOMP_API_VERSION
make distcheck works now
Initialize m4
Licensed the library inder the LGPL