metadata bug ifxes
merging upstream
merging upstream
merging upstream
metadata editor backwards compatibility
Merge branch 'v1.0.0' of github.com:prose/prose into metadata
adding missing semicolons
Merge branch 'v1.0.0' of github.com:prose/prose into metadata
populate multiselect from metadata, support null values for default metadata, parse yaml default_metadata
Merge pull request #328 from prose/metadata

metadata editor bug fixes, closes #327