Ability to change the Bundle identifier (CFBundleIdentifier) for an xcode build

This feature adds the ability to change the bundle ID for a given build.

![screen shot 2014-01-07 at 16 51 51](https://f.cloud.github.com/assets/1743753/1860462/a91e0cbc-77b3-11e3-9a11-b2cf167b7882.png)

Closes the feature:
https://issues.jenkins-ci.org/browse/JENKINS-13887