Layercake RDFLib with ORDF

Layercake is a branch of rdflib used at the Cleveland Clinic
with FuXi. Amongst other things it has some support for remote
SPARQL stores (relevant to `ticket 105`_). Some additional
information is available from the `wiki page explaining layercake`_
and the `layercake message on FuXi discuss`_.

.. _ticket 105:
.. _wiki page explaining layercake:
.. _layercake message on FuXi discuss:

Installation recipe

Before following the usual install procedure, do::

    pip install pyparsing
    pip install -e svn+

And then for example,::

    pip install hg+
    pip install -e hg+
    pip instlal -e hg+
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.