Now all chronologies for a particular core are returned, rather than just the first (which is usually the oldest).  This means an extra object is returned from `get_download`, called `chronologies`, it stores all the chronologies associated with a record, and by default the newest (the last one in the `chonologies` list) is now associated with `sample.meta`.
Merge pull request #69 from SimonGoring/master

Now all chronologies for a particular core are returned, rather than jus...