Feature: Provide Kernel.compile(...) method for pre-compilation of kernel...

Feature: Provide Kernel.compile(...) method for pre-compilation of kernel without executing it - small test improvement

src/test/java/com/aparapi/runtime/KernelCompileOnlyTest.java

@@ -44,7 +44,7 @@ public class KernelCompileOnlyTest {
    protected class CLKernelManager extends KernelManager {
      @Override
      protected List<Device.TYPE> getPreferredDeviceTypes() {
-        return Arrays.asList(Device.TYPE.ACC, Device.TYPE.GPU);
+        return Arrays.asList(Device.TYPE.ACC, Device.TYPE.GPU, Device.TYPE.CPU);
      }
    }