Initial commit of navigation controller

Initial structure of the navigation controller and XML based
navigation graph.

Test: navigation/integration-tests/testapp compiles and runs

Change-Id: I08023947b7c510cd9704bda42edefe1c50cc8430
diff --git a/navigation/.gitignore b/navigation/.gitignore
new file mode 100644
index 0000000..be4e6f1
--- /dev/null
+++ b/navigation/.gitignore
@@ -0,0 +1,4 @@
+local.properties
+maven-repo/
+build/
+*.DS_Store