Switch to explicit dataset loading. Issue #126.
Get worker communication ready for mutiple datasets. Issue #126.
Need to call query() to set up duplicate dataset properly
[recline][s]: update recline to fix issue with dupe of header fields into data - fixes #132.

* Fix in recline https://github.com/okfn/recline/commit/5d24fd474d6e6bd065039d058ef64c6db4454df9
Merge branch 'master' into gh-pages