Introduced OmitEnumerableParameterRequestRelay,

which will handle requests for IEnumerable<T> parameters, and return an
empty array if the context resolves it as OmitSpecimen.
Returned result from context.
Correctly handled requests for other objects

than ParameterInfo.
Filtered away all non-enumerable parameters.
Returned an empty array if context returns Omit.
Added a Null Guard Clause.
Demonstrated that OmitEnumerableParameter...Relay

can be used to create a small recursive graph.
Introduced OmitArrayParameterRequestRelay,

which will do the same as OmitEnumerableParameterRequestRelay, just for
arrays instead of IEnumerable<T>.
Returned specimen from context.
Returned NoSpecimen for non-parameter requests.
Filtered out requests for non-array parameters.
Returned empty array when context returns Omit.
Added a Null Guard Clause.
Enabled creation of array of recursive graphs.
Documented OmitEnumerableParameterRequestRelay.
Documented OmitArrayParameterRequestRelay.
Incremented patch version,

in order to indicate that the addition of two Specimen Builders, which can
be used to address the problem of creating forests of recursive graphs
mostly constitutes a bug fix. This resolves #244
(https://github.com/AutoFixture/AutoFixture/issues/244).