Update build to make building easier

- Add go-nes as a submodule.  This adds Go as a build requirement but
  removes the need to aquire, build, and configure it separately
- Remove the ca65 & ld65 customizations so compiling will work with a
  release build without issue.
- Don't remove bitmap files with the standard clean recipe.  This
  removes the need for aesprite to build from a "clean" directory.
- Updated README to reflect changes.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "go-nes"]
+	path = go-nes
+	url = https://github.com/zorchenhimer/go-nes.git

Makefile

@@ -1,17 +1,18 @@
-export PATH := ../../go-nes/bin:/c/Program Files/Aseprite:../../tools/cc65/bin:$(PATH)
+#export PATH := ../../go-nes/bin:/c/Program Files/Aseprite:../../tools/cc65/bin:$(PATH)
 .PHONY: all clean
 
 NAME = platforming
 
 NESCFG = nes_000.cfg
-CAFLAGS = -g -t nes --color-messages
-LDFLAGS = -C $(NESCFG) --dbgfile bin/$(NAME).dbg -m bin/$(NAME).map --color-messages
+CAFLAGS = -g -t nes
+LDFLAGS = -C $(NESCFG) --dbgfile bin/$(NAME).dbg -m bin/$(NAME).map
+CHRUTIL = go-nes/bin/chrutil
 
 SOURCES = main.asm \
 		  map-data.asm \
 		  tiles.chr
 
-all: bin/ bin/$(NAME).nes
+all: $(CHRUTIL) bin/ bin/$(NAME).nes
 
 bin/:
 	mkdir -p bin
@@ -23,11 +24,16 @@ bin/$(NAME).nes: bin/$(NAME).o
 	ld65 $(LDFLAGS) -o $@ $^
 
 clean:
-	-rm -rf bin/*
-	-rm -rf *.chr *.bmp
+	-rm bin/* *.chr
+
+cleanall: clean
+	-rm *.bmp go-nes/bin/*
 
 tiles.chr: tiles.bmp
-	chrutil -o $@ $<
+	$(CHRUTIL) -o $@ $<
 
 tiles.bmp: tiles.aseprite
 	aseprite -b $< --save-as $@
+
+$(CHRUTIL):
+	$(MAKE) -C go-nes bin/chrutil

README.md

@@ -2,11 +2,19 @@
 
 This is a simple platforming physics demo for the NES in 6502 assembly.
 
-## Build Requirements
+## Building
+
+Building requires the following software installed:
 
 - GNU Make
-- ca65 and ld65
-- chrutil
+- [cc65 compiler suite](https://github.com/cc65/cc65)
+- Go
+- Aesprite (optional)
+
+To build:
+
+    $ git clone https://github.com/zorchenhimer/nes-platforming.git
+    $ cd nes-platforming && make
 
 ## License