ENH: support @comment
add a bibfile with features
ENH: support @comment
add a bibfile with features
add features tests
Separate @preamble
ENH: check that bibtype belongs to a known type
Merge branch 'features' of github.com:sciunto/python-bibtexparser into features

Conflicts:
	CHANGELOG
	bibtexparser/bparser.py
add wrong.bib file
add unittest for issue #13
Merge branch 'features'