moddified add_project and add_subject
updated documentation and demographics objects
improved support for demographics collection
added Project Activity
docs cleanup
add: namespace fixes and general syntax cleanup
add: gitignore file
add: extraction for mr and demographics studies and acquisitions
fix: add option to limit study parts
Merge pull request #5 from nicholsn/enh/xnat-shim

NIDASH Shims Notebook - XNAT Example