Upgrade Groovy to 2.5.7

Author: jericks

README.rst

@@ -135,7 +135,7 @@ Versions
 +-----------+----------+-----------+--------+----------+
 | GeoScript | GeoTools | GeoServer | JTS    | Groovy   |
 +-----------+----------+-----------+--------+----------+
-| 1.14      | 22       | 2.16      | 1.16.0 | 2.5.6    |
+| 1.14      | 22       | 2.16      | 1.16.0 | 2.5.7    |
 +-----------+----------+-----------+--------+----------+
 | 1.13      | 21       | 2.15      | 1.16.0 | 2.5.6    |
 +-----------+----------+-----------+--------+----------+

pom.xml

@@ -270,27 +270,27 @@
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy</artifactId>
-            <version>2.5.6</version>
+            <version>2.5.7</version>
         </dependency>
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-sql</artifactId>
-            <version>2.5.6</version>
+            <version>2.5.7</version>
         </dependency>
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-xml</artifactId>
-            <version>2.5.6</version>
+            <version>2.5.7</version>
         </dependency>
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-json</artifactId>
-            <version>2.5.6</version>
+            <version>2.5.7</version>
         </dependency>
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-swing</artifactId>
-            <version>2.5.6</version>
+            <version>2.5.7</version>
         </dependency>
         <dependency>
             <groupId>com.opencsv</groupId>