Merge pull request #54 from asutton/master

Updates to concept wording
misc clean-up
unique_ptr<int[]> to delete memory allocated with array-new, fixes #55
fix label of iterable_strlen assembly listing, fixes #56
s/universal reference/forwarding reference/
proposal citations via pandoc-citeproc
when comparing counted_iterators, compare the base iterators instead of just the counts
get markdown proposal ready for pandoc conversion to html
Adding text to concepts.