Update okhttp.

Updated to commit 19a21936ffbb5e358799af9e4fb7306af45f38.

This also moves src/ to okhttp/src/ to stay faithful
to the original okhttp tree & to make it easier to pull
updates.

Change-Id: Ia1971823f31e5c6957d831f368e3a1fcce38d44d
diff --git a/samples/pom.xml b/samples/pom.xml
new file mode 100644
index 0000000..2462fd0
--- /dev/null
+++ b/samples/pom.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>com.squareup.okhttp</groupId>
+    <artifactId>parent</artifactId>
+    <version>1.2.2-SNAPSHOT</version>
+  </parent>
+
+  <groupId>com.squareup.okhttp.sample</groupId>
+  <artifactId>sample-parent</artifactId>
+  <packaging>pom</packaging>
+  <name>Samples (Parent)</name>
+
+  <modules>
+    <module>guide</module>
+    <module>simple-client</module>
+    <module>static-server</module>
+  </modules>
+</project>