added preliminary shared memory physics client/server

fix a bug in CommonMultiBodyBase: don't use data if it hasn't been allocated

examples/SharedMemory/premake4.lua

@@ -0,0 +1,22 @@
+
+project "App_SharedMemoryPhysics"
+
+if _OPTIONS["ios"] then
+	kind "WindowedApp"
+else	
+	kind "ConsoleApp"
+end
+
+includedirs {"../../src"}
+
+links {
+	"Bullet3Common",	"BulletDynamics","BulletCollision", "LinearMath"
+}
+
+language "C++"
+
+files {
+	"**.cpp",
+	"**.h",
+}
+