ion: first pass at stretchy buffers.

However, len is expressed as number of elements, and capacity as
number of bytes.

bitwise/ion/Makefile

@@ -0,0 +1,12 @@
+TARGET :=	ion
+OBJS :=		$(TARGET).o
+CFLAGS :=	-g
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) $(CFLAGS) -o $@ $(OBJS)
+
+.PHONY: clean
+clean:
+	rm -f $(OBJS) $(TARGET)