Use 2.3.1 to pick up a fix for

http://jira.codehaus.org/browse/MCOMPILER-109

Also see http://d.hatena.ne.jp/ssogabe/20091030/1256904551#c
and http://d.hatena.ne.jp/sikakura/20110308/1299546068 --- the issue is
that it fails when built on Japanese locale.

pom.xml

@@ -208,7 +208,7 @@ THE SOFTWARE.
 
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>2.3.1</version>
+        <version>2.3.2</version>
         <configuration><!-- we specify this in the parent POM, so this is redundant, but otherwise IntelliJ is unhappy -->
           <source>1.5</source>
           <target>1.5</target>