some refactoring
Merge branch 'master' of github.com:opencog/opencog
composition cases progressing
Merge pull request #595 from keyvan-m-sadeghi/master

Interval Algebra - Composition
Merge fix for #596
Merge pull request #597 from cosmoharrigan/pln

PLN - fix for #596 and update log output option
Temporary change for #598 - make confidence of NotAB 1.0 instead of 0.001 in modusPonensFormula
Set default behavior of chainers.py logging to quiet rather than verbose
Add in-progress tuffy 'smokes' PLN test example
Merge pull request #599 from cosmoharrigan/pln

PLN minor update for #598 and example
Add in-progress PLN / Relex2Logic example
Separate interactive agent PLN wrapper
Add additional data for tuffy smokes example test, and refactor code
Add in-progress relex2logic / pln demo
Move interactive agent wrapper to general examples folder
Minor refactoring on smokes example
Merge pull request #600 from cosmoharrigan/pln

In-progress PLN and Relex2Logic test examples
Update README
Merge pull request #604 from cosmoharrigan/pln

Update README
Update testing data for PLN smokes example