The EmptySpecimenCommand class is moved to the Ploeh.AutoFixture namespace.
Addressing CA1020(AvoidNamespacesWithFewTypes)

 - The Ploeh.AutoFixture namespace is derived from autofixture.
Patch version increment

 - Indicates that the previous namespace changes are actually not the
    backward compatible change but as it is trivial, it is proper way to
    treat a bug fix.