Sprint 72 Update

During this sprint we continued our work on structural metadata support by implementing a means of uploading structure information in an XML file, whether via the interactive interface or via batch upload. We fixed a timeout problem where the interaction was confusing when the playback session timed out. And we did the metadata and design work necessary for adding new fields to hold imported notes and system IDs from MARC records. We made progress on integrating oEmbed for the player page, which will eventually allow us to support Facebook embeddability.