Import glob2regex

It's still missing ast optimization and some code cleanup is also
needed, but it should be working in the general case.
Also write a small unit test for it.

lib/glob2regex/include/glob2regex/glob2regex.hpp

@@ -0,0 +1,27 @@
+/* Copyright 2015, 2016, Michele Santullo
+ * This file is part of "dindexer".
+ *
+ * "dindexer" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "dindexer" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "dindexer".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef id98DC1C17239B4DD38C8697EC91BC3DA4
+#define id98DC1C17239B4DD38C8697EC91BC3DA4
+
+#include <string>
+
+namespace g2r {
+	std::string convert ( const std::string& parGlob );
+} //namespace g2r
+
+#endif