Improve build times for Travis by removing sudo commands from .travis.yml

[davidrpugh]

@jstac @mmcky

Travis CI has new container based infrastructure that should substantially speed up build times for CI. To use it, at least for the moment, we can't use sudo commands in the .travis.yml file.

Should we consider re-working the .travis.yml file to remove the sudo commands?

[mmcky]

@cc7768 Is this straight forward? I see we have two sudo commands

  - sudo rm -rf /dev/shm
  - sudo ln -s /run/shm /dev/shm

during install setup.

[davidrpugh]

Might be...I am not exactly sure what those lines are doing. I know what the unix commands are doing, but I don't understand why they need to be there.

[cc7768]

I picked up most of that file from this gist. He said it was an issue with multi-processing on Travis. It could have been fixed by now (though I don't know) -- Feel free to experiment and remove those lines.

[davidrpugh]

In that case we might as well delete and see what happens...

[mmcky]

This has been fixed and Travis now compiles using containers.