Initial iOS support

[simlay]

Pretty consistently, people open up the generated CMakeCache.txt and change CMAKE_OSX_SYSROOT to point to the iOS SDK path. This PR makes it so they don't have to do it manually. I've also gone ahead and added the iphonesimulator and the phone target to travis so there's a small amount of CI. I'm open to adding cargo-dinghy to effectively run cargo test for the iOS simulator if we'd like. I just wanted to keep the PR small.

Let me know if there's any changes you'd like.

[google-cla]

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[google-cla]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[antiagainst]

Nice, thanks!

[simlay]

Did this break the build? I'm looking at the current build and it's failed but there's not a clear reason why.

[antiagainst]

Yeah I think there were some issues with the configuration. I've #85, which hopefully can fix the issue.