Added default support to DummyValueCreationSession for type Lazy<T>

Based off of the behavior that is defined for Task. Discussed in issue #358.
This is quite picky of me, but see how it looks like you removed ConfigurationSpecs and added it again, and the same for LazySpecs? The reason is that every green line in the diff ends only in a linefeed (LF), instead of a (CRLF).