Limiting versions of setuptools and sphinx

[bsipocz]

This is to deal temporarily with the latest travis failures that are not affecting functionality.

See details in #222 and #224.

ping @eteq

[bsipocz]

I think the failure is due to an unrelated coveralls glitch, restarting that build should make it pass.

[eteq]

@bsipocz - yep, I think you're right - re-started travis and if it passes this is good to merge.

The Appveyor failures are more mysterious.... but it looks like it's been present for a while so I won't worry about that right now.

[eteq]

I really don't get why coveralls is unhappy. I'm 99% sure its unrelated though, so I'm going to merge this now and we'll see if its consistent over the next few builds.

[bsipocz]

The Appveyor failures are more mysterious.... but it looks like it's been present for a while so I won't worry about that right now.

Seems somewhat related, at least it went wrong at the same time.

[bsipocz]

Yep, same problem there, setuptools got upgraded to 20.x.

Sadly ci-helpers doesn't support PACKAGENAME_VERSION for appveyor, we should live with the failures until #222 is solved. setuptools is installed at the very beginning, so overriding it by hard-wiring a version number in CONDA_DEPENDENCIES won't help either (I think, but haven't checked).