Enable copy assignment operator for iterator class
#389
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Closes #360
Closes #334
Expands on 686ae04 to carry over some of these changes to
iteratoras well (i.e., not justconst_iterator). Note that I have not changediteratorto be arandom_access_iterator_tag, I left it as aforward_iterator_tag. Making a random access iterator requires many extra methods. I don't even think we implement all of them forconst_iterator. I've added some comments about that and if we have issues in the future with iterators we should look and see if we just need more methods.