lab_template_return.h

/* Complete the template definition of the add_together()
	function.
	
	add_together() should take two iterators as its input parameters.
	These iterators represent the beginning and end of the sequence to be 
	added together.

	A useful hint, if you want to know the variable type that an iterator
	contains you can use the following code:
	    typename iterator_traits<ITER>::value_type
	Where ITER is either a template placeholder or an actual iterator.
	This line can be used to specify variable or function return types.

	For example:
	    std::vector<int> v {1, 2, 3};
	    std::vector<int>::iterator it = v.begin();

	    typename std::iterator_traits<it>::value_type intValue = *it;
	*/

// COMPLETE ME