Rearranged white spaces and remove the unnecessary namespaces.
Removed the unnecessary namespace.
Clarified the exception message of the NullSpecimenException when the constructor is NullConstructorInfo.
+ The object of the SpecimenBuilder type returned not mocked specimen as default.
+ An instance of a parameter having BuildAttribute in a test method is constructed as not mocked.
+ Deleted the AsNotMocked method.

+ If any mock setting is specified, The SpecimenBuilder class will automatically set true to the IsMocked property.
Used the IsDefined method instead of the GetCustomAttributes mehtod.
Clarified the exception message.
Merge branch 'master' into v3.x
Updated version to v3.0.0-build22.