Flag labels support
Fixed issue #26

BitFieldListFilter now filters based on a "bitwise or" operation as opposed to
an exact match of the bitmask.
Update ignore patterns
Improve tests
Allow default to be specified as a list of flag names
1.6.4
Merge pull request #27 from bendavis78/issue_26

Fix for issue #26
Removed Bit.prepare() and BitHandler.prepare() which can cause problems because they don't match the number of args expected by Field.get_prep_lookup().
Merge pull request #29 from ianawilson/master

Removed Bit.prepare() and BitHandler.prepare()
Merge pull request #25 from bendavis78/flag_labels

Flag labels support
Merge pull request #1 from disqus/master

merge to master