Add testing framework to LayoutLib.

This change adds an end to end test which loads the framework resources
and a test app and ensures that no exceptions or warnings are thrown.

The change also adds project configuration for intelliJ.

Change-Id: I7b67c0f1a2af2dac95df7f3231cab537b9826d7d
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000..e206d70
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" useUTFGuessing="true" native2AsciiForPropertiesFiles="false" />
+</project>
+