Basic decoding of GVariant values (except for Variant).

Change-Id: I43e495a57c1f045b91ce01d89f2010f61b5fb8f5
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..530c14c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*~
+/.idea
+/target