Set release version 2.3

Author: dpaukov

README.md

@@ -367,7 +367,7 @@ Include the following section into your `pom.xml` file.
 <dependency>
   <groupId>com.googlecode.combinatoricslib</groupId>
   <artifactId>combinatoricslib</artifactId>
-  <version>2.2</version>
+  <version>2.3</version>
   <scope>compile</scope>
 </dependency>
 ```

pom.xml

@@ -4,7 +4,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.googlecode.combinatoricslib</groupId>
   <artifactId>combinatoricslib</artifactId>
-  <version>2.3-SNAPSHOT</version>
+  <version>2.3</version>
   <name>CombinatoricsLib</name>
   <description>Very simple java library to generate permutations, combinations and other
     combinatorial sequences.