Xcode 6 compatibility

These changes fix hyperloop-ios to work with Xcode 6. One point to note:
If you try to include any frameworks, it doesn't seem to pull them in.
However, for a project i.e basic, physics, etc it works.

I now am suspicious that there are issues with hyperloop-common that prevent frameworks from being included correctly.

When you try to run spritekit or the opengl or the life examples you get the following error message:


```
TypeError: Cannot read property 'property' of undefined
    at Object.after (/Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/lib/compiler/ast.js:776:58)
    at AST_Node.transform (/Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:69:28)
    at /Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:192:43
    at AST_Node.transform (/Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:68:21)
    at /Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:197:33
    at AST_Node.transform (/Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:68:21)
    at /Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:163:49
    at AST_Node.transform (/Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:68:21)
    at /Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/transform.js:80:25
    at doit (/Users/andrewmcelroy/repos/appcelerator-core-projects/hyperloop/hyperloop-common/node_modules/uglify-js/lib/utils.js:121:23)
```
i have created lib/xcode.js which contains that method.