Merge pull request #116 from GordonSmith/XYData

Ensure _data matches original data.
Merge pull request #117 from GordonSmith/PersistData

Persist title and data (is this a good idea?)
Merge pull request #118 from GordonSmith/GraphTune001

Graph tuning 001
Demo/Test Page(s)

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>