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see #26

#19

Normalize tag parameters using Ruby's OptionParser. This
breaks the API but gives us a standard way of handling
parameters going forward.

This commit also adds optional prefixes used by the
bibliography, cite and reference tags. See #12.

the cited option will limit the bibilography to those entries
which have been previously cited on the same page using the
cite tag.

see #10

#1

#1

turned bibiliography into lists

#1