ENH: Updated the Readme.md
ENH: Added infrastructure for git hooks and remote data

This uses the same infrastructure as the SimpleITK-Notebooks
for maintaining outputs.
ENH: Added data sources to repository.
ENH: Cleared outputs from notebooks.
COMP: Preparing for merging, removed all outputs.
Merge pull request #3 from aghayoor/notebookTests2

Commit that includes git commit infrastructure and begining of registration tests