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See #124

 * Add group_by option, to group bibliography entries.
 * Add proper names for entry types, and months.
 * Add support for multilevel sorting.

Removed tag option for raw bibtex entry.
Added a note in the documentation on the usage of this option.

See #117

See #118

fixes #112

see #108

see #84

This simple 'solution' returns all entries for ``--max 0``.  Now, to
avoid this the logic of ``offset`` and ``max`` needs to become more
complex - unless I am missing an obvious solution.

see #82

this time add add tests to prove it

fix #53

fix #77

see #78

see #77

see #69

see #65