Make timelines for other record types

[jeremyboggs]

Omeka 2.0 includes Dublin Core metadata for Collections, including the DC:Date field. We should consider whether to make timelines from collection records and other kinds of records.

[erochest]

This is related to #48.

Each exhibit gets its own record type, don't try to mix them.

• schema change;
• migration;
• config form change;
• change the search page;
• change the query; and
• icon to indicate the type of record.

[m-art-in]

Is this still open? I would like to add a collection to the timeline - but this failed.