Fix core gitignore

Author: Martin Gleize

core/.gitignore

@@ -1,15 +1,15 @@
 /target/
 /output/
-data/
-resources/
-prediction/
+/data/
+/resources/
+/prediction/
 
 scripts/bcts.supervised.properties
-logs/
+/logs/
 bct-s.properties
 scripts/*.properties
 scripts/res*.txt
-test_ie_index/
+/test_ie_index/
 PropertiesExplained.properties
 PropertiesExplained
 com.ibm.drl.hbcp.inforetrieval.apr/*.properties