Intersphinx support, local rtd docs theme
lazycache is easier to read, doesn't eat docstrings
Merge pull request #620 from seandst/intersphinx

Intersphinx support, local rtd docs theme
Merge pull request #621 from seandst/lazycache

lazycache is easier to read, doesn't eat docstrings
Stop generating sphinx warnings if a lazycache has no docstring
Merge pull request #624 from seandst/lazycache

Stop generating sphinx warnings if a lazycache has no docstring
Merge pull request #615 from psav/pxe_objects_and_tests

PXE objects and tests
PXE refactor