Update 2013-03-14-using-bigmemory-with-rcpp.md

Added the BH dependency to the Rcpp header (required to compile successfully), and added a note about package development (you need C++11 as a SystemRequirement to compile without warnings).
Package != Gallery post.  

This is not the place to discuss problem with packages, or how to fix them.

*Please* use the mailing list for that.