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/samples/pom.xml b/samples/pom.xml
index b212e99..62d1240 100644
--- a/samples/pom.xml
+++ b/samples/pom.xml
@@ -16,6 +16,7 @@
 
   <modules>
     <module>guide</module>
+    <module>crawler</module>
     <module>simple-client</module>
     <module>static-server</module>
   </modules>