Tweak travis settings

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

.travis.yml

@@ -17,3 +17,7 @@ cache:
     - $HOME/.gradle/wrapper/
 
 script: ./gradlew clean build
+
+env:
+  global:
+    - GRADLE_OPTS="-Xms256m"

build.gradle

@@ -29,6 +29,16 @@ configure(allprojects) {
 	apply plugin: 'idea'
 	apply plugin: 'propdeps'
 
+	if (System.env.TRAVIS == 'true') {
+		tasks.withType(GroovyCompile) {
+			groovyOptions.fork = false
+		}
+		tasks.withType(Test) {
+			maxParallelForks = 1
+			minHeapSize = '256m'
+		}
+	}
+
 	compileJava {
 		sourceCompatibility = 1.7
 		targetCompatibility = 1.7