[TIMOB-17268] TiAPI: Make call stack available through Error.prototype.stack property

problem

I want to have access to the call stack via the non-standard [Error.prototype.stack](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/Stack) property. While non-standard, it is available in most browsers and in node.js as well. The primary reason for this ticket is that the absence of this property implemented for all platforms causes vague error output with ti-mocha, or any unit testing library that relies on Error.prototype.stack for its stack trace, which is most of them. Aside from this, though, it would just make debugging, testing, and customized error output so much easier.

test case

function foo() {
	function bar() {
		console.log(new Error().stack);
	}
	bar();
}
foo();

expected

In the above test case, I would expect that the complete stack trace would be printed to the console. For example, in node.js, the exact same code would result in the following:

≫ node test.js 
Error
    at bar (/Users/tlukasavage/development/ti-stack/test.js:3:15)
    at foo (/Users/tlukasavage/development/ti-stack/test.js:5:2)
    at Object.<anonymous> (/Users/tlukasavage/development/ti-stack/test.js:7:1)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:906:3

actual

The output is null on iOS and Android. I have no tested our other supported platforms.