Nested module declarations using 0.10.0 syntax no longer work.

[unbibium]

When you use a nested module with the 0.10.0 syntax, the test throws a MissingMethodException. I can't tell the root cause, but the stack trace seems to indicate that some code within Geb is still trying to call getPage() in a context where it no longer exists.

Example provided in https://gist.github.com/unbibium/147278c917b50cd576c3 -- you'll have to adjust the filename of course.