build: allow building with and for Java 8

Author: bogovicj

pom.xml

@@ -131,6 +131,9 @@
 		<license.organizationName>Saalfeld Lab</license.organizationName>
 		<license.copyrightOwners>Stephan Saalfeld</license.copyrightOwners>
 
+		<scijava.jvm.version>8</scijava.jvm.version>
+		<scijava.jvm.build.version>[1.8.0-101,)</scijava.jvm.build.version>
+
 		<doclint>none</doclint>
 
 		<!-- NB: Deploy releases to the SciJava Maven repository. -->