minor adjustment for Makefile and document.lua

Makefile

@@ -32,7 +32,7 @@ CXXFLAGS:=-O3 $(SYSROOT)
 LDFLAGS:= $(SYSROOT)
 ARM_CFLAGS:=-march=armv6
 # use this for debugging:
-#CFLAGS:=-O0 -g
+#CFLAGS:=-O0 -g $(SYSROOT)
 
 DYNAMICLIBSTDCPP:=-lstdc++
 ifdef STATICLIBSTDCPP
@@ -217,7 +217,7 @@ customupdate: all
 	cp -rpL data/*.css $(INSTALL_DIR)/data
 	cp -rpL fonts $(INSTALL_DIR)
 	cp -r resources $(INSTALL_DIR)
-	cp -r frontend $(INSTALL_DIR)
+	cp -rpL frontend $(INSTALL_DIR)
 	mkdir $(INSTALL_DIR)/fonts/host
 	zip -9 -r kindlepdfviewer-$(VERSION).zip $(INSTALL_DIR) launchpad/ kite/
 	rm -Rf $(INSTALL_DIR)

frontend/document/document.lua

@@ -70,6 +70,10 @@ function Document:new(o)
 	return o
 end
 
+-- override this method to open a document
+function Document:init()
+end
+
 -- this might be overridden by a document implementation
 function Document:unlock(password)
 	-- return true instead when the password provided unlocked the document