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Merge pull request #83 from tmaier/master

Refactor Entry#to_rdf
Merge branch 'master' of github.com:inukshuk/bibtex-ruby
3.1.0
update manifest
Add RDFConverter#bdsk_url
Add RDFConverter#date_modified
Add institution as fallback to #publisher
Add one more bdsk-file field to RDFConverter::DEFAULT_REMOVE_FROM_FALLBACK
Fix #type
Fix #year

Could return "2014-" instead of "2014"
Add "Dissertation" to #thesis_degree
Remove :type from fallback when it has a thesis degree
Add #annote