[OLINGO-1406] added some toString() methods (#26)

General and minor improvement during release

lib/commons-api/src/main/java/org/apache/olingo/commons/api/data/EntityCollection.java

@@ -136,4 +136,9 @@ public class EntityCollection extends AbstractEntityCollection {
     result = 31 * result + (deltaLink == null ? 0 : deltaLink.hashCode());
     return result;
   }
+
+  @Override
+  public String toString() {
+    return entities.toString();
+  }
 }

lib/commons-core/src/main/java/org/apache/olingo/commons/core/edm/AbstractEdmNamed.java

@@ -35,4 +35,10 @@ public abstract class AbstractEdmNamed extends AbstractEdmAnnotatable implements
   public String getName() {
     return name;
   }
+
+  @Override
+  public String toString() {
+    return name;
+  }
+
 }

lib/server-core/src/main/java/org/apache/olingo/server/core/uri/UriParameterImpl.java

@@ -78,4 +78,8 @@ public class UriParameterImpl implements UriParameter {
     return this;
   }
 
+  @Override
+  public String toString() {
+    return name;
+  }
 }