Don't repeat any enterNode() implementation from FileReflector

When updating the location stack it's possible to just peek at the end
of the appropriate array to get the class/function reflector. Hook
parsing can also be done after the original enterNode() has a go since
it only relies on the location stack.
Merge pull request #1 from joncave/filereflector-simplification

Don't repeat any enterNode() implementation from FileReflector