Add Tinker as a Forkable Example App

[technobly]

This will expose users that go straight to the Web IDE to what's exactly in the Tinker app, and give them a way to re-program it to their Spark Core without requiring a Factory Reset, and also allow them to easily modify it.

Asside: Some confusion can occur when a user programs the Blink an LED example to their Core, and they are unsure how to get back to Tinker. Factory Reset is a fine tool for this, but also forces new WiFi credentials to be entered which takes more time than simply re-flashing Tinker and having it re-connect to the Cloud ready to go.

[joegoggins]

This is a good idea @technobly , thanks for brining it up. I'm wondering if it'd be better to deliver this functionality by exposing a "Factory Reset" button on the settings drawer instead. This would keep the firmware's version of Tinker in sync with the example and potentially make more sense from a user's standpoint.

[technobly]

I was thinking about that since it's similar to how the iOS and I believe the Android app works...

aside: I went to verify this action in iOS app and found it was currently crashing on iOS 8.1 when opening the Device ID drawer. Filled an issue earlier.

I'm not following "firmware's version of Tinker in sync" but as long as it was easy to find I think this could be a good solution.

I do also like the idea of being able to fork the code and modify it for the purpose of learning how Spark.function()'s work. So maybe do both? :)