Add UsageService to the gateway

Author: ctrueden

src/main/java/org/scijava/AbstractGateway.java

@@ -58,6 +58,7 @@
 import org.scijava.thread.ThreadService;
 import org.scijava.tool.IconService;
 import org.scijava.tool.ToolService;
+import org.scijava.usage.UsageService;
 import org.scijava.widget.WidgetService;
 
 /**
@@ -212,6 +213,11 @@ public ToolService tool() {
 		return get(ToolService.class);
 	}
 
+	@Override
+	public UsageService usage() {
+		return get(UsageService.class);
+	}
+
 	@Override
 	public WidgetService widget() {
 		return get(WidgetService.class);

src/main/java/org/scijava/Gateway.java

@@ -58,6 +58,7 @@
 import org.scijava.thread.ThreadService;
 import org.scijava.tool.IconService;
 import org.scijava.tool.ToolService;
+import org.scijava.usage.UsageService;
 import org.scijava.widget.WidgetService;
 
 /**
@@ -189,6 +190,8 @@ public interface Gateway extends RichPlugin, Versioned {
 
 	ToolService tool();
 
+	UsageService usage();
+
 	WidgetService widget();
 
 	// -- Gateway methods - application --