Fixed errors and documented everything

Makefile

@@ -1,7 +1,7 @@
 # Makefile for the nibbles lab.
 # ---> Compile with gamke on BSD systems! <---
 
-all: nibbles_asm nibbles_asm_start
+all: nibbles_c nibbles_asm nibbles_asm_start
 
 # Rule for compiling C source
 .c.o:
@@ -25,7 +25,10 @@ nibbles_asm: main.o nibbles.o helpers.o
 nibbles_asm_start: start.o nibbles.o helpers.o
 	gcc -m32 -lcurses -lc -nostdlib $^ -o $@
 
+# Documentation
+docs: cnibbles.c nibbles.S start.S
+	docco --languages=docco-languages.json $^
+
 clean:
-	rm -f *~
 	rm -f *.o
 	rm -f nibbles_c nibbles_asm nibbles_asm_start