A template trait for iterable collections.

Collection classes mixing in this trait provide a method iterator which returns an iterator over all the elements contained in the collection. They also provide a method newBuilder which creates a builder for collections of the same kind.

This trait implements Traversable's foreach method by stepping through all elements. Subclasses of Iterable should re-implement foreach with something more efficient, if possible.

This trait adds methods iterator, zip, zipAll, zipWithIndex, sameElements, takeRight, dropRight to the methods inherited from trait Traversable.