added configuration for file field
WIP on file field
Merge branch 'master' into test/options
file field base functionality ready; TODO: test and add JS enhancements
Merge branch 'master' into test/options
file field updates when options are saved with no file to be uploaded
Merge branch 'master' into test/options
WordPress media js functionality added for censeo file field
Merge branch 'master' into test/options