Injective type families

[Ben Gamari]

Hi Jan,

A few questions came up this morning while speaking Andres Loeh about
injective type families:

  1. Should this feature be placed behind a LANGUAGE pragma? Afterall,
     functional dependencies feel very similar and in this case we
     require a pragma. Now would be the last opportunity to change this.

  2. Could you perhaps add some text to better motivate the feature in
     the users guide? Referring to the paper for the details of
     semantics of the feature and its implementation is fine, but
     expecting a new user to refer to the paper to even know *why* they
     might want to use it seems a bit unfriendly.

Thanks!

Cheers,

- Ben
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