Make bindings accessible in SharedLibrary classes.

[nestoracunablanco]

For the library loading a Pogo is instantiated, which has a different implementation while getting an object.

This POGO does not read the bindings. In the PogoMetaClassGetPropertySite the implementation can be found. This throws a runtime exception, which suits well for the common purposes, but not when we try to emulate the Jenkins shared library behaviour.

So the workaround is to add the bindings as properties dynamically inside InterceptingGCL.

This change tries to solve the issue #478

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• [ X] Ensure you have provided tests - that demonstrates feature works or fixes the issue

[stchar]

Please add on more test scenario.

[nestoracunablanco]

Hi @stchar, could you please take a look at my changes? Is that what you requested?
Thanks in advance!

[stchar]

Looks good. Thank you!