Added new historical weather observation experiment

Top-level stuff and introduction to the dataset
update to dataset assessment text
Exchanged 'rows' against '@rows' in the JSON generation, to be in line with the other 'system specific' keys.
Renamed map, switched to bNode.
Reconciled the issues in the conversion documents with the one on the issue list.
Reconciled the issues in the conversion documents with the one on the issue list.
further updates ...
fix to order list syntax
work in progress.
Merge branch 'gh-pages' of https://github.com/w3c/csvw into gh-pages
All working (thanks Anastasia) except for 'offers', 'location'
Which seem to be missing as we use too many bnodes in the graph. Maybe.
The behavior of the 'note' property was misunderstood, and it is not really clear why it would be singled out. I removed it for the generation at the moment. (CSV->RDF/JSON)
Merge branch 'gh-pages' of https://github.com/w3c/csvw into gh-pages
Doh. Stupid markup mistake
The note on the uri template was accidentally removed; pushed it back.
Moving files around.
Merge branch 'gh-pages' of https://github.com/w3c/csvw into gh-pages
Notes.
Current output triples.
More care in writing source.properties tmp file.