build: Add a test directory

Add a test directory to host future unit tests.

Change-Id: I5072cb3055386f7b1718edc45241c723d9e63a54
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/configure.ac b/configure.ac
index e738f3f..15abf12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,5 +53,5 @@
 AC_ARG_VAR(YAML_PATH, [The path to the yaml config files.])
 AS_IF([test "x$YAML_PATH" == "x"], [YAML_PATH="$srcdir/example"])
 
-AC_CONFIG_FILES([Makefile src/Makefile])
+AC_CONFIG_FILES([Makefile src/Makefile src/test/Makefile])
 AC_OUTPUT