Build with Java 7

Change-Id: I2893a766d48a85b3cf276da67f5a48e8ea9ce011
diff --git a/pom.xml b/pom.xml
index 1168d8b..f1afadd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,8 +61,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>2.3.2</version>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
+          <source>1.7</source>
+          <target>1.7</target>
           <encoding>UTF-8</encoding>
         </configuration>
       </plugin>