fix typo in Vector<>:: push_back and push_front

     inline const_iterator end() const   { return array() + size(); }

     inline void reserve(size_t n) { setCapacity(n); }

     inline bool empty() const{ return isEmpty(); }

     inline void push_back(const TYPE& item)  { insertAt(size(), item); }

     inline void push_front(const TYPE& item) { insertAt(0, item); }

     inline void push_back(const TYPE& item)  { insertAt(item, size()); }

     inline void push_front(const TYPE& item) { insertAt(item, 0); }

     inline iterator erase(iterator pos) {

         return begin() + removeItemsAt(pos-array());

     }