Merge pull request #1 from satra/master

moving from ni-dm to notebooks
Merge pull request #2 from satra/master

add csv to rdf converter example
first commit for an xnat shim
Merge pull request #4 from nicholsn/enh/xnat-shim

Creating a Database Shim for XNAT
Merge pull request #3 from satra/enh/freesurfer

WIP: Object Models - FreeSurfer Example
enh: cleaned up intro
doc: nidm figure
fix: nolan's pointers
Merge pull request #8 from satra/enh/intro

Revised Intro to NIDM
enh: cleaned up freesurfer output also to use latest prov to convert to ttl directly