Add Hashable instance for Options Cairo R2

diagrams / diagrams-cairo

Cairo backend for diagrams

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Closed byorgey closed 10 years ago

byorgey commented 10 years ago

Depends on diagrams/diagrams-lib#146.

This pull request:

Adds a dependency on hashable > 1.1 (part of the HP)
Adds a dependency on the DeriveGeneric extension (since GHC 7.2)
Adds a Hashable instance for Options Cairo R2; needed for some pending changes/reorganization to diagrams-builder.