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New features:
* allow specifying the encoding of a BibTeX database file (20 and 25)
* BibTeX 'month' field: support integers and "<month> <day>" values
* BibTeX 'pages' field: support "10", "10+", "10-12" and "10--12" formats
* BibTeX entry types: map the non-standard 'thesis' and 'report' entries
* update the CSL schema to version 1.0.1 (5)
* update the CSL locales to commit 49bf3fc0
Bug fixed:
* avoid crash when there is nothing to affix (David Lesieur)
* fix BibTeX month to CSL month mapping (24)
* strip leading/trailing whitespace from BibTeX values (37)