Added flags to language specifiction. Added optional expect string to language specification. Added some exaple grammars for testing and demos

examples/fib.smallc

@@ -0,0 +1,21 @@
+#include "stdio.h"
+
+int fib(int n) {
+  if (n == 0) { return 0; } 
+  if (n == 1) { return 1; }
+  return fib(n - 1) + fib(n - 2);
+}
+
+main() {
+  
+  int n;
+  int i;
+  
+  while (i < 10) {
+    n = fib(10);
+    print(n);
+    i = i + 1;
+  }
+
+  return 0;
+}