src: Reorganizing source code in preparation to merge NRD code

Note that as of this commit, there are several changes in location of
compiled binaries in `build/` folder:

* `nfd` has been moved to `build/bin/nfd`
* `unit-tests` has been split into `unit-tests-core` and `unit-tests-daemon`

Change-Id: I2c830c117879edbaa5457d6423c13f0273285919
Refs: #1486
diff --git a/version.hpp b/version.hpp
new file mode 100644
index 0000000..08dccaf
--- /dev/null
+++ b/version.hpp
@@ -0,0 +1,55 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  Regents of the University of California,
+ *                     Arizona Board of Regents,
+ *                     Colorado State University,
+ *                     University Pierre & Marie Curie, Sorbonne University,
+ *                     Washington University in St. Louis,
+ *                     Beijing Institute of Technology
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#ifndef NFD_VERSION_HPP
+#define NFD_VERSION_HPP
+
+namespace nfd {
+
+/** NFD version follows Semantic Versioning 2.0.0 specification
+ *  http://semver.org/
+ */
+
+/** \brief NFD version represented as an integer
+ *
+ *  MAJOR*1000000 + MINOR*1000 + PATCH
+ */
+#define NFD_VERSION 1000
+
+/** \brief NFD version represented as a string
+ *
+ *  MAJOR.MINOR.PATCH
+ */
+#define NFD_VERSION_STRING "0.1.0"
+
+/// MAJOR version
+#define NFD_VERSION_MAJOR (NFD_VERSION / 1000000)
+/// MINOR version
+#define NFD_VERSION_MINOR (NFD_VERSION % 1000000 / 1000)
+/// PATCH version
+#define NFD_VERSION_PATCH (NFD_VERSION % 1000)
+
+} // namespace nfd
+
+#endif // NFD_VERSION_HPP