Squashed bug causing incorrect digits. Now fully working

I totally brainfarted and put this->preDigits.size() in the for
loop comparison clause, which gets re-evaluated every loop.
So it was leaving digits on the stack that should have been
printed, causing errors both immediately and down the line.

Spigot.hpp

@@ -11,13 +11,11 @@ public:
     void pump(void);
 
 private:
-    int numDigits;
     std::vector<int> spigotList;
     int spigotListLength;
     int carry;
     std::vector<int> preDigits;
 
-
 };
 
 #endif