Use test scope for scijava-common tests lib

It was an oversight, which now causes pain because the scijava-common
tests library includes some extra services and plugins which hose up
downstream applications.

Author: ctrueden

pom.xml

@@ -101,6 +101,7 @@
 			<groupId>org.scijava</groupId>
 			<artifactId>scijava-common</artifactId>
 			<classifier>tests</classifier>
+			<scope>test</scope>
 		</dependency>
 	</dependencies>