Move API Key to .alforge file

[vmitchell85]

I think it would be beneficial to have users place their Forge API key into a .alforge file in their home directory instead of using Alfred to store it.

Part of my desire for this is due to the fact the key is so long and you can't see much once you've pasted it into Alfred. The other reason is I feel the API key gets 'hidden' to some degree given where it is being stored (in the alfred workflow directory).