Partial Revert "std::tuple support (Resolving #103) (#104)"

This partial reverts commit 8b6a9c2.

The being-reverted-change put uarg{1..10} in all translation unit that
include "boost/phoenix/stl.hpp", should that file is being included by
multiple translation unit, each of those translation units will have one
definition of each of uarg{1..10}. Thus, we'll run into below error:

> multiple definition of `boost::phoenix::placeholders::uarg1'

Partial Revert the change in question by removing
"boost/phoenix/stl/tuple.hpp" from "boost/phoenix/stl.hpp".

include/boost/phoenix/stl.hpp

@@ -11,6 +11,5 @@
 
 #include <boost/phoenix/stl/algorithm.hpp>
 #include <boost/phoenix/stl/container.hpp>
-#include <boost/phoenix/stl/tuple.hpp>
 
 #endif