Update to allow a multi-level CKAN structure.

[pjf]

Right now we're putting all CKAN files in a single directory, and I'm
writing the client to only look in a single directory. However it
might make sense to allow sub directories, as this will allow for
greater structure in the future.

For this, we need to:

• Update the client to search sub-dirs.
• Update travis tests to search sub-dirs.
• Move any WIP files onto branches, until they're ready to be merged.

[pjf]

Closed with KSP-CKAN/CKAN-meta@4f6b5ce .

Didn't really move the WIP files into branches, but there's only two of them, and they've been renamed so they won't get used. :)