Add time cost output for planner.
Merge branch 'master' of http://github.com/opencog/opencog into shujing
Disable loading facts for Einstein puzzle test, because it required a Unity test map contain some specific objects.
Merge pull request #495 from shujingke/shujing

Disable loading facts for Einstein puzzle test, because it requires the corresponding Unity map, or it will crash.
Allow the createNavigationPlanAction to choose if including the last step.
Merge pull request #496 from shujingke/shujing

Allow the createNavigationPlanAction to choose if including the last ste...
Update status
Fix typos
Merge pull request #497 from linas/learn

minor README updates and typos
Move PLN atom types into a trivial module for #484
Merge pull request #500 from cosmoharrigan/pln_types

Move PLN atom types into a trivial module for #484