new approach to assign holdout
Add observation query
Change groundFactorGraph function prototype - add calibrationSettings
Support specifying custom obervation variables
Merge branch 'master' into observation_variables
Merge branch 'master' into yilong-tuffy_port
doc, code and example of Tuffy port
Tuffy port: clean up dummy files
Tuffy port: rename directory and refine doc
Tuffy port: edit doc
refined comments and doc
changed class name
remove duplicate example
rm .svn
more examples for tuffy port
more examples
minor change of doc and example names
Remove .svn
Edit documentation
Fix spelling of variable name