Some documentation on versioning information.

doc/guide/version.hpp

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+/*! @page timer mlpack version information
+
+@section vercode mlpack versions in code
+
+mlpack provides a couple of convenience macros and functions to get the version
+of mlpack.  More information (and straightforward code) can be found in
+src/mlpack/core/util/version.hpp.
+
+The following three macros provide major, minor, and patch versions of mlpack
+(i.e. for mlpack-x.y.z, 'x' is the major version, 'y' is the minor version, and
+'z' is the patch version):
+
+@code
+__MLPACK_VERSION_MAJOR
+__MLPACK_VERSION_MINOR
+__MLPACK_VERSION_PATCH
+@endcode
+
+In addition, the function \c mlpack::util::GetVersion() returns the mlpack
+version as a string (for instance, "mlpack 1.0.8").
+
+@section verex mlpack executable versions
+
+Each mlpack executable supports the \c --version (or \c -V ) option, which will
+print the version of mlpack used.  If the version is not an official release but
+instead from svn trunk, the version will be "mlpack trunk" (and may have a
+revision number appended to "trunk").
+
+*/