creating commons-math-2.2-RC4 tag

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/tags/MATH_2_2_RC4@1074308 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 41ffcc0..b8762ec 100644
--- a/pom.xml
+++ b/pom.xml
@@ -242,6 +242,7 @@
   <properties>
     <commons.componentid>math</commons.componentid>
     <commons.release.version>2.2</commons.release.version>
+    <commons.rc.version>RC4</commons.rc.version>
     <commons.binary.suffix></commons.binary.suffix>
     <commons.jira.id>MATH</commons.jira.id>
     <commons.jira.pid>12310485</commons.jira.pid>