Some improvements to readme and added blisp_dlog

include/blisp_util.h

@@ -2,12 +2,24 @@
 #ifndef _BLISP_UTIL_H
 #define _BLISP_UTIL_H
 
+#include <stdarg.h>
+#include <stdio.h>
 #ifdef WIN32
 #include <windows.h>
 #else
 #include <time.h>
 #endif
 
+static void blisp_dlog(const char* format, ...)
+{
+  fflush(stdout);
+  va_list args;
+  va_start(args, format);
+  vfprintf(stderr, format, args);
+  va_end(args);
+}
+
+
 static void sleep_ms(int milliseconds) {
 #ifdef WIN32
   Sleep(milliseconds);