Iterate over collections

This is an attempt to add smalltalk-like streams to Moose. It currently works with ArrayRefs and HashRefs. * next The next method provides the next item in the colletion. For arrays it returns the element of the array For hashs it returns a pair as a hashref with the keys: key and value * has_next The has_next method is a boolean method that is true if there is another item in the colletion after the current item. and falue if there isn't. * peek The peek method returns the next item without moving the state of the iterator forward. It returns undef if it is at the end of the collection. * reset Resets the cursor, so you can iterate through the elements again.

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