Add some man pages (alloc, free, version).

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diff --git a/docs/man/nng_version.adoc b/docs/man/nng_version.adoc
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+= nng_version(3)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+== NAME
+
+nng_version - report library version
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+const char * nng_version(void);
+-----------
+
+== DESCRIPTION
+
+The `nng_version()` function returns a human readable version
+number for the _nng_ library.  This is intended for output in
+programs, and so forth.
+
+Additionally, compile time version information is available
+via some predefined macros:
+
+`NNG_MAJOR_VERSION`:: Major version number.
+`NNG_MINOR_VERSION`:: Minor version number.
+`NNG_PATCH_VERSION`:: Patch version number.
+
+The _nng_ library is developed and released using
+http:///www.semver.org[Semantic Versioning 2.0], and
+the version numbers reported refer to both the API and the
+library itself.  (The ABI -- binary interface -- between the
+library and the application is controlled in a similar, but different
+manner depending upon the link options and how the library is built.)
+
+== RETURN VALUES
+
+C string (NUL-terminated) containing the library version number.
+
+== ERRORS
+
+None.
+
+== SEE ALSO
+
+<<libnng#,libnng(3)>>,
+<<nng#,nng(7)>>