Update to Gerrit 2.9 API and use Java 7

Change-Id: Ic524a15331da7d938080f1a436e25c4746563933
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

pom.xml

diff --git a/pom.xml b/pom.xml
index 0bbb64a..1114e12 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
 
   <groupId>com.googlesource.gerrit.plugins.bugzilla</groupId>
   <artifactId>hooks-bugzilla</artifactId>
-  <version>2.8-SNAPSHOT</version>
+  <version>2.9-SNAPSHOT</version>
 
   <name>Gerrit - Bugzilla support</name>
 
@@ -43,8 +43,8 @@
         <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>