Log Message:
Update to 0.3.0.2

Changelog:
* 0.3.0.2
 - Fix tarball.

* 0.3.0.1
 - Use CPP to reduce code duplication.
 - GHC 7.4 support

* 0.3.0.0
 - Split modules into Lazy and Strict variants, no default choice.
   Add Hashable instance to Data.Unique.Really for all implementations.
 - Better fix for potential race condition involving 'Unique'.
 - add -Wall flag and fix some warnings it reveals
 - Add strict and lazy variant of the `Vault` data type.