Tweak travis settings

- Try to get test build to run on travis
- Relates to #272

.travis.yml

@@ -20,4 +20,4 @@ script: ./gradlew clean build
 
 env:
   global:
-    - GRADLE_OPTS="-Xms256m"
+    - GRADLE_OPTS="-Xms256m -Xmx384m"

build.gradle

@@ -36,6 +36,7 @@ configure(allprojects) {
 		tasks.withType(Test) {
 			maxParallelForks = 1
 			minHeapSize = '256m'
+			maxHeapSize = '384m'
 		}
 	}