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Update porting_to_new_environment.md

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Fixed broken link. 
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docs/porting_to_new_environment.md
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@ -36,7 +36,7 @@ filterMiddleware.destroy()
Only use this if you intend to construct the [metamask-inpage-provider](https://github.com/MetaMask/metamask-inpage-provider) over a stream!
The most confusing part about porting MetaMask to a new platform is the way we provide the Web3 API over a series of streams between contexts. Once you understand how we create the [MetamaskInpageProvider](https://github.com/MetaMask/metamask-inpage-provider/blob/master/index.js) in the [inpage.js script](../app/scripts/inpage.js), you will be able to understand how the [port-stream](../app/scripts/lib/port-stream.js) is just a thin wrapper around the [postMessage API](https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage), and a similar stream API can be wrapped around any communication channel to communicate with the `MetaMaskController` via its `setupUntrustedCommunication(stream, domain)` method.
The most confusing part about porting MetaMask to a new platform is the way we provide the Web3 API over a series of streams between contexts. Once you understand how we create the [MetamaskInpageProvider](https://github.com/MetaMask/metamask-inpage-provider/blob/master/index.js) in the [inpage.js script](../app/scripts/inpage.js), you will be able to understand how the [extension-port-stream](https://github.com/MetaMask/extension-port-stream) is just a thin wrapper around the [Port postMessage API](https://developer.chrome.com/extensions/runtime#property-Port-postMessage), which you can also refer to [chrome extensions message passing](https://developer.chrome.com/extensions/messaging#connect), and a similar stream API can be wrapped around any communication channel to communicate with the `MetaMaskController` via its `setupUntrustedCommunication(stream, domain)` method.
### The MetaMask Controller