Created branch bug_dont_make_unknown_metadata_ids_fail from master
Avoid raising error when field is tagged with unknown id

The correct semantics are to skip unknown fields as they are likely an optional field added with
a newer schama version than the one driving this deseriazation. The code in struct.c using
getFieldMetadataByID() already has the correct skip behavior when NULL is returned.
bump patch version; update authors and emails in gemspec
Merge pull request #9 from whitepages/bug_dont_make_unknown_metadata_ids_fail

Bug dont make unknown metadata ids fail