Make release 3.2.1.

Major changes:
* Fix bug when calling plugin from macro in headless mode.

Author: iarganda

pom.xml

@@ -11,7 +11,7 @@
 
 	<groupId>sc.fiji</groupId>
 	<artifactId>AnalyzeSkeleton_</artifactId>
-	<version>3.2.1-SNAPSHOT</version>
+	<version>3.2.1</version>
 
 	<name>Analyze Skeleton</name>
 	<description>Analysis of 2D and 3D skeleton images.</description>