Hotfix v1.9.4

[philippjfr]

Unfortunately a regression in the regrid operation was introduced in the hotfix 1.9.3 branch. This PR represents the fixes for that branch, and should not be merged.

Other PRs that would be good to get into this release are:

• Fixed bug in bokeh TablePlot not escaping dimensions correctly #2336
• Bumped Travis testing dependencies to latest versions #2329

The latter would be good to ensure that we are actually testing against the latest versions of different libraries, which is what caused the regrid bug to slip through.

[philippjfr]

Once we get the flake fixes in #2340 merged this will be ready to release.

[philippjfr]

I've now cherry-picked the relevant flake fixes onto this branch. Should be ready to release now.

[jlstevens]

All the PRs mentioned are now merged. Maybe it is worth also getting #2346 in as that is bug fixes too?

[jbednar]

Several of the items in #2346 look like they are for Elements not present in 1.9.4, though...

[jlstevens]

That is a good point. If it is too much pain to cherry pick the commits that do apply to 1.9.4, then I suppose those fixes can simply be left out.

[philippjfr]

That's okay, I'll remove those while cherry-picking.

[philippjfr]

@jlstevens Now done, I think we can release this now.

[jlstevens]

The key tests we expect to pass (flakes, nosetests) are now passing on both Python 2 and 3. I'm now preparing the release.

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