Travis tweaks. Speed things up by skipping 'install'. Give Maven more

memory.

.travis.yml

@@ -1,5 +1,13 @@
 language: java
-script: "travis_retry mvn clean package license:check -Dmaven.test.skip=false"
-cache:
-  directories:
-  - $HOME/.m2
+
+# Skip 'mvn install', not really needed for our tests
+install: "echo 'Skipping install, dependencies will be downloaded during build and test.'"
+
+# Build and test 
+#  travis_retry = retry build/test up to 3 times
+#  -B = batch/non-interactive mode (recommended for CI)
+#  -V = display version info before build
+script: "travis_retry mvn clean package license:check -Dmaven.test.skip=false -B -V"
+
+# Give Maven 2GB of memory to work with
+env: MAVEN_OPTS=-Xmx2048M