Merge branch 'enforcer-rules'

This branch cleans up the enforcer rules,
and adds a handy new requireElements rule.

Author: ctrueden

pom.xml

@@ -10,7 +10,7 @@
 	</parent>
 
 	<artifactId>scijava-maven-plugin</artifactId>
-	<version>0.5.2-SNAPSHOT</version>
+	<version>1.0.0-SNAPSHOT</version>
 	<packaging>maven-plugin</packaging>
 
 	<name>SciJava plugin for Maven</name>