Updated for Xcode 5.0 with recommended settings.

Xcode 5.0.2 recommends these changes for compatibility. I understand if some of them are not desirable, but it is nice to build from scratch without warnings, including a warning that "you should upgrade the project to the latest Xcode".

I have tested these changes in Xcode 4.6 and found no issues there either.

I understand if you want to perform these changes yourself, too. These settings can be personal and opinionated.
![capture decran 2013-12-18 a 10 05 56](https://f.cloud.github.com/assets/74659/1774289/caeb1550-67f6-11e3-91b5-751a7698773f.png)