Upgrade OkHttp to newer code

This update includes changes up to
68affbd24d63620e1785ea847f1936760947b9ae / master /
14th March 2014.

Importantly, it contains a DiskLruCache fix which
broke several apps.
https://github.com/square/okhttp/issues/646

Change-Id: I8a489e6d0937a58fad10423154bad939ea4da868
diff --git a/pom.xml b/pom.xml
index 2216c73..c534a1d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -138,21 +138,28 @@
           <artifactId>maven-javadoc-plugin</artifactId>
           <version>2.9</version>
         </plugin>
-
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-release-plugin</artifactId>
-          <version>2.3.2</version>
-          <configuration>
-            <autoVersionSubmodules>true</autoVersionSubmodules>
-          </configuration>
-        </plugin>
       </plugins>
     </pluginManagement>
 
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-release-plugin</artifactId>
+        <version>2.4.2</version>
+        <dependencies>
+          <dependency>
+            <groupId>org.apache.maven.scm</groupId>
+            <artifactId>maven-scm-provider-gitexe</artifactId>
+            <version>1.9</version>
+          </dependency>
+        </dependencies>
+        <configuration>
+          <autoVersionSubmodules>true</autoVersionSubmodules>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
         <version>2.10</version>
         <configuration>