Extended Objective-C language section

[ChocoChipset]

Extended the Objective-C language section with the following information:

1. How to configure an iOS project using the default script.
2. Travis configuration file example.
3. Link to actual build script used by the server [update].

Hope it proves useful for the next users.

[sarahhodne]

Thank you for writing this! However, I'm in the progress of updating the default build script. I'll check if this is still working when I get that updated and merge this in then.

[ChocoChipset]

Super. Let me know! I'll be glad to update the commits as needed.

[joshk]

Closing as this repo is now deprecated.

You can create a PR at the new home for the docs at https://github.com/travis-ci/docs-travis-ci-com

cc/ @henrikhodne