expand IE matrix

[boneskull]

saucelabs should test ie9, ie10, ie11

[coderbyheart]

Actually I think it would be better to split the execution of the saucelabs test up so they are separate on Travis. I'll make that change and update the PR.

[boneskull]

Actually I think it would be better to split the execution of the saucelabs test up so they are separate on Travis. I'll make that change and update the PR.

If they are separate, how can we guarantee we don't run over the concurrency limit?

[coderbyheart]

If set the concurrency limit of travis to 5 … https://blog.travis-ci.com/2014-07-18-per-repository-concurrency-setting/

[coderbyheart]

But it's actually breaking for other reasons, I've just started the build again, let's see: https://travis-ci.org/coderbyheart/mocha