Switch travis to jobs format.

.travis.yml

@@ -1,9 +1,6 @@
 language: java
 jdk:
   - oraclejdk8
-env:
-  - DITA_OT=3.2
-  - DITA_OT=2.5.4
 
 before_install:
   - zip -r com.here.validate.svrl.text-rules.zip . -x *.zip* *.git/* *temp/* *out/*
@@ -16,12 +13,22 @@ install:
   - dita-ot-$DITA_OT/bin/dita --install https://github.com/jason-fox/com.here.validate.svrl/archive/master.zip
   - dita-ot-$DITA_OT/bin/dita --install com.here.validate.svrl.text-rules.zip
 
-before_script:
-  - dita-ot-$DITA_OT/bin/dita --input dita-ot-$DITA_OT/plugins/com.here.validate.svrl.text-rules -f xsl-instrument
-
 script:
   - travis_wait dita-ot-$DITA_OT/bin/dita --input dita-ot-$DITA_OT/plugins/com.here.validate.svrl.text-rules -f unit-test --output . -v
 
-after_success:
-  - cp dita-ot-$DITA_OT/plugins/fox.jason.unit-test/resource/pom.xml pom.xml
-  - mvn clean org.eluder.coveralls:coveralls-maven-plugin:report  
+jobs:
+  include:
+    - stage: test
+      name: "Unit Tests: DITA_OT=3.3"
+      env: DITA_OT=3.3
+
+      before_script:
+        - dita-ot-$DITA_OT/bin/dita --input dita-ot-$DITA_OT/plugins/com.here.validate.svrl.text-rules -f xsl-instrument
+
+      after_success:
+        - cp dita-ot-$DITA_OT/plugins/fox.jason.unit-test/resource/pom.xml pom.xml
+        - mvn clean org.eluder.coveralls:coveralls-maven-plugin:report
+
+    - stage: test
+      name: "Unit Tests: DITA_OT=2.5.4"
+      env: DITA_OT=2.5.4