#define RCPP_USING_CXX11 if compiler claims full c++11 support
If C++11 support is detected during Rcpp compilation, report it via Rcpp::capabilities()[["Full C++11 support"]] and Rcpp::rcpp_can_use_cxx11()
Switch unit test requiring c++11 support to use Rcpp:::capabilities()[["Full C++11 support"]] instead of unreliable compiler flag sniffing.
remove RCPP_USE_STD_FUNCTION again, instead use the autodetected RCPP_USING_CXX11
update NEWS.Rd to reflect c++11 detection changes
Merge pull request #166 from cauthmann/std11detection

Std11detection