Make currentNode prepend a slash

This is because the currentNode is always absolute

Change-Id: I0a52e46c28204df374d07f9d2378be6821cd18fd
diff --git a/src/parser.cpp b/src/parser.cpp
index 0eb94fd..a3550a6 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -51,7 +51,7 @@
 
 std::string Parser::currentNode() const
 {
-    return pathToDataString(m_curDir);
+    return "/" + pathToDataString(m_curDir);
 }
 
 std::set<std::string> Parser::availableNodes(const boost::optional<path_>& path) const