Modified bibulous.py's main program to accept only a single filename as argument (the AUX file) rather than two. Also improved the handling of cases where a citekey is missing from the database.
Removed the 'use_csquotes' option, since this is handled transparently with the use of \providecommand{} in the bibliography preamble.
Removed the last vestige of the 'missing_data_exceptions' option.
Removed the option 'warnings' because it was not being used.
Removed the unused option 'remove_abbrev_newlines' inside bibulous.py.
Updated the TODO.rst file.
Removed the 'warnings' option from test/test1.bst.