SUMO import
SUMO: nested expressions don't have TruthValues
better printing
SUMO: remove documentation
Put SUMO in its own directory
Remove documentary predicates from SUMO import
Merge pull request #453 from jadeoneill/master

Import SUMO ontology into OpenCog
Add script to remove timestamps from log file
Improve robustness by better matching timestamps by using rm_timestamps.sh
Added optimal code to the 3DPathfinder, enabling it looking for a better path by inverse the start and end point.
Made the navigation plan to use optimal pathfinder.
Make test_atomspace.py compatible with changes made to atom printing format in #450 to address CythonAtomSpace unit test failure in #452
Merge pull request #454 from cosmoharrigan/cythontest

Make test_atomspace.py compatible with changes made to atom printing for...
Temporarily disable failing PLN unit tests (see #442)
Merge pull request #455 from cosmoharrigan/plntests

Temporarily disable failing PLN unit tests (see #442)
Added an interface to get the block from a given location.
Fixed a bug when there is only one numeric variable candidate , didn't check its fintess.
Fixed should not stand on water.
Merge pull request #456 from shujingke/planner

Planner