Fails to compile with GHC 7.0.4 and GHC 7.2.2

[hvr]

Noticed this while fixing up cabal meta-data:

For GHC 7.0:

src/Data/Bytes/Get.hs:4:14:
     Unsupported extension: DefaultSignatures
 cabal: Error: some packages failed to install:
 bytes-0.14.1.3 failed during the building phase.

and for GHC 7.2.2:

 src/Data/Bytes/Serial.hs:90:8:
     Could not find module `GHC.Generics'
     It is a member of the hidden package `ghc-prim'.
     Perhaps you need to add `ghc-prim' to the build-depends in your .cabal file.
     Use -v to see a list of the files searched for.
 cabal: Error: some packages failed to install:
 bytes-0.14.1.3 failed during the building phase.

[hvr]

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