editor.js: show datasets created on successful query
Merge branch 'master' into dhalperi-show-datasets-created
datasets: remove download link for big datasets

Can only download datasets where we know the size and fewer than 100M cells.
(Number of cells is # cols * # rows.)
update test_myria_up to test both large and small datasets

- add TwitterK
- add numTuples for both Twitter and TwitterK
- check that Twitter's download link does not show in the page (too big)
- check that TwitterK's download link does show in the page (small)
Merge pull request #173 from uwescience/dhalperi-show-datasets-created

Dhalperi show datasets created
datasets: add sorting
datasets.html: icons when sorting
Merge pull request #174 from uwescience/dhalperi-sort-datasets-page

Dhalperi sort datasets page
multiple physical algebra.
adapt to https://github.com/uwescience/myria/pull/575