Added spacetime atom_types.script
Load spacetime_types.scm
Added initial files for temporal reasoning full-pipeline demo
Moved temporal demo to pln folder, refactored
Corrected line that led to error in temporal_compute method
Added import of functions to increase readability
Added prints for debugging purposes

Note: to be removed later
Created README
Fixed references
Added pull request as reference
Merge pull request #934 from sebastianruder/temporal

AtTimeLinks and initial commits for temporal reasoning pipeline demo