Merge pull request xtaci#80 from kounkou/patch-makefile

This pull request solve the cleaning of *.o file issue

Author: xtaci

Makefile

@@ -263,5 +263,5 @@ suffix_array_demo: $(SRCDIR)/suffix_array_demo.cpp
 $(CPP) $(C11FLAGS) -o $@ $^ $(INCLUDEDIR) $(LIBS)
 
 clean:
-rm -rf $(PROGRAMS) *.dSYM
+rm -rf $(PROGRAMS) *.dSYM *.o