some automake fixes & clean ups

Makefile.am

+AUTOMAKE_OPTIONS = foreign
 ACLOCAL_AMFLAGS="-Im4"
+
+EXTRA_DIST = prepare.sh
+
+AM_CPPFLAGS = -I$(top_srcdir)/include
+AM_CFLAGS =
+AM_CXXFLAGS = $(AM_CFLAGS)
+
 lib_LTLIBRARIES = libmobject-store.la
 libmobject_store_la_SOURCES = src/libmobject-store.c \
 			include/mobject-store.h
 
 include_HEADERS = include/mobject-store.h
 libmobject_la_CPPFLAGS = -I${srcdir}/include
+
+include Make.rules
+