Authentication for ghEntity

[mariari]

Currently how GhEntity and it's children classes work, is that you give it a raw dictionary, and from there GhEntity creates a ZnClient

This has issues when rate limiting is had, or when private data is wanted

GhEntity >> createFrom: aKey with: aBlock onError: anErrorBlock [
	^ rawData 
		at: aKey
		ifPresent: [ :url | 
			| trimmedUrl |
			trimmedUrl := url
				copyWithRegex: '{.*}'
				matchesTranslatedUsing: [ :each | ''].
			ZnClient new 
				get: trimmedUrl
				onSuccess: [ :result | 
					[
						aBlock value: (STON fromString: result)
					] on: Error do: [ :e | anErrorBlock value ] ]
				onError: [ anErrorBlock value ] ]
		ifAbsent: [ {} ]
]

This can easily be changed such that ghEntity has a new slot for an authentication key if desired.

I may work on this myself, and submit a patch as it seems quite trivial to do, however I may not have the time.