CI: Build for more platforms and compilers

[chansuke]

#23
Add minimum compiler version & 32-bit support

[joshlf]

Thanks for the PR, and welcome!

Looks good except for one thing: can you squash into a single commit and make the commit message something like Travis: Add minimum support Rust version and 32-bit support?

[chansuke]

@joshlf Thank you for the comment!!OK.

[joshlf]

So the Travis builds are failing for reasons that they weren't failing before. Can you take a look at those and make appropriate fixes?

[chansuke]

@joshlf I'll fix it.

[joshlf]

Still getting the same error on some builds, e.g. https://travis-ci.org/ezrosent/allocators-rs/jobs/275984270

[chansuke]

@joshlf Sorry about that.I've checked and fixed errors but another error(error: Could not compile bagpipe) occurs in some of environment.

[joshlf]

Hmm OK, I'll take a look. Might have to do with a bug we just uncovered elsewhere, so we might have to fix that first and then rebase those changes into this PR.

[joshlf]

Hmm I'm not sure what's going on. For example, on Linux/Rust nightly, elfmalloc's tests are resulting in a SIGKILL getting sent to the test process. I'm not sure what that's about.

[chansuke]

@joshlf
I've pushed it but I couldn't figure out the Could not compile bagpipe error.

[joshlf]

Every one of the builds is now failing with the error no $ARCH specified. Are you sure you're clicking on the new builds and not just re-loading an old build from one of your previous commits? Click on the Travis CI "Details" link in the checks dialogue at the bottom of this page.

[joshlf]

Also, we found the source of the bsalloc compilation issue. We're going to have to wait for this PR to land in lazy_static: rust-lang-nursery/lazy-static.rs#84

[chansuke]

@joshlf Ok.Thank you for the information.

[joshlf]

OK, lazy_static has pushed a new version, and I've merged a change to use that version. If you pull the latest version of master and then rebase master into this branch, we should be good to go.

[joshlf]

Moved to #135.