Attempting to exclude JDK from MRI builds on TravisCI.

Author: jdantonio

.travis.yml

@@ -15,21 +15,26 @@ jdk: # for JRuby only
 matrix:
   exclude:
     - rvm: 2.2.0
+      jdk: openjdk7
       jdk: oraclejdk8
     - rvm: 2.1.5
+      jdk: openjdk7
       jdk: oraclejdk8
     - rvm: 2.1.4
+      jdk: openjdk7
       jdk: oraclejdk8
     - rvm: 2.0.0
+      jdk: openjdk7
       jdk: oraclejdk8
     - rvm: 1.9.3
+      jdk: openjdk7
       jdk: oraclejdk8
     - rvm: ruby-head
+      jdk: openjdk7
       jdk: oraclejdk8
     - rvm: rbx-2
+      jdk: openjdk7
       jdk: oraclejdk8
-
-matrix:
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head