linker: Don't put linker stuff in the config. Now that we want to deep-copy configuration, we can't put objects in there. We create a wrapper for pages that will store linker-specific objects in a separate attribute.

cov-core==1.15.0
coverage==3.7.1
mock==1.0.1
pytest==2.7.0
pytest-cov==1.8.1
pytest-mock==0.4.3