Update pom.xml (#630)

Updating to include google client api libraries.

Author: piaxc

flexible/cloudsql/pom.xml

@@ -51,6 +51,21 @@
 <!-- [END properties] -->
 
   <dependencies>
+    <dependency>
+      <groupId>com.google.api-client</groupId>
+      <artifactId>google-api-client</artifactId>
+      <version>1.21.0</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api-client</groupId>
+      <artifactId>google-api-client-appengine</artifactId>
+      <version>1.21.0</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api-client</groupId>
+      <artifactId>google-api-client-servlet</artifactId>
+      <version>1.21.0</version>
+    </dependency>
     <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>javax.servlet-api</artifactId>