Remove hunter and submodules

And use external project instead.  This should make it easier to keep
our systems up to date with yocto.

Change-Id: Id2c9f3e474eebf2194eaf58b0c572f7a1421def6
diff --git a/crow/include/crow.h b/crow/include/crow.h
index 5945354..94e7995 100644
--- a/crow/include/crow.h
+++ b/crow/include/crow.h
@@ -19,4 +19,4 @@
 #include "crow/middleware_context.h"
 #include "crow/http_connection.h"
 #include "crow/http_server.h"
-#include "crow/app.h"
+#include "crow/app.h"
\ No newline at end of file