[Aux] Added several useful metafunctions to ease integer-based metaprogramming.
[Aux] Migrating from `boost::any` to `boost::variant` configuration. Part 1.
[Aux] Migrating. Part 2.
[Aux] Migrating is in progress.

Variant class now lives into its own file.
[Aux] Migrating is almost done.
[Aux] Dynamic object now can determine if some key contains in it.
[Aux] Migrating to the new dynamic keeper system has been finished for json initialization.
[Aux] Base holder class can now accept its underlying value.
[Task] Another task added.
[Trace] Enable tracing for logger.

This is very early view. It definitely needs some love.
[Code Clean] Removing debug output.
[Aux] Dynamic class can now check if some type is contained in it right now.
[Aux] Migrating is finished.
[Code Clean] Dead code elimination.
[Code Clean] Minor renaming and code style done.
[Code Style] Style.
[GCC 4.4] Removed unnecessary `template` disambiguator.