Switch to openjdk7.

.travis.yml

@@ -1,17 +1,7 @@
 language: java
-addons:
-  apt:
-    packages:
-      - openjdk-6-jdk
 jdk:
-    - openjdk6
-# Download a version of maven compatible with openjdk6
-install:
-  - echo "Downloading Maven 3.0";
-  - wget https://archive.apache.org/dist/maven/binaries/apache-maven-3.0-bin.zip || travis_terminate 1
-  - unzip -qq apache-maven-3.0-bin.zip || travis_terminate 1
-  - export M2_HOME=$PWD/apache-maven-3.0
-  - export PATH=$M2_HOME/bin:$PATH
-  - mvn -version
-  - mvn clean package install -DskipTests -Dgpg.skip
+    - openjdk7
+# Do not install anything so that we can use our custom script. Instead, just
+# return true.
+install: true
 script: "./travis-build.sh"