Added kfold script
Merge pull request #87 from zifeishan/master

Added kfold script in util
Merge branch 'master' of github.com:dennybritz/deepdive
Add XOR factor function
Better example template configuration.
Allow capitalized factor functions
sampler update
Add XOR function parser spec.
Fix XOR function parser spec.
Fix parser for XOR factor function.
Automatically create weight analytic view for each variable.
Sequential weight and variable ID fix.