[ALOY-1332] Alloy.version does not match actual version

Alloy.version is [hard-coded](https://github.com/appcelerator/alloy/blob/master/Alloy/lib/alloy.js#L30) and not up to date with the actual version in [package.json](https://github.com/appcelerator/alloy/blob/master/package.json#L17). For sample apps I need to check that the user is using a supported Alloy version, which because of this I can not. I suggest we do a hacky RegEx replace [here](https://github.com/appcelerator/alloy/blob/master/Alloy/commands/compile/index.js#L164) or maybe better move [lib/alloy.js](https://github.com/appcelerator/alloy/blob/master/Alloy/lib/alloy.js) to the templates folder and properly replace a placeholder for the version with the one in package.json. That way we don't have to update the version in two places.