Merge branch 'master' of github.com:Capgemini/grade-ladder

Merging upstream changes.

Author: Andrew Harmel-Law

LICENCE.md

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+This grade-ladder is both took insporation from, and evolved from [Camille Fournier](http://twitter.com/skalille)'s [Rent the Runway grade ladder] (http://dresscode.renttherunway.com/blog/ladder) which in turn took its inspiration from the original Foursquare eng ladder made by Harry Heymann, Jason Liszka and Andrew Hogue.
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+We are in turn sharing our evolution, licenced under the creative commons Attribution-NonCommercial-ShareAlike 4.0 International licence (CC BY-NC-SA 4.0).  That means we too are totally chilled with you taking it and making it your own.  Just please, be cool, and don't use it to make any money. Oh and please credit those who came before you, just as we have.  Thanks!
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+https://creativecommons.org/licenses/by-nc-sa/4.0/