* missing make_pair() for r-value refs
hello guys!
the `make_pair()` for r-value refs is required for r-value, otherwise `non-copyable` but `movable` can be constructed.
thanks!
* fix for prev commit
conditional support for r-values was fixed
* the test case was added
* fix for prev commit
* Update Jamfile
* one more fix for Jamfile
* the forgotten r-value ctor was added
* ah, they should be conditional
