Add boost include snippet

Boost headers have a ".hpp" extension and are contained within the boost
directory. This commit adds a "binc" snippet - a dedicated snippet to
include boost headers.

snippets/cpp.snippets

@@ -5,6 +5,8 @@ extends c
 # #include <...>
 snippet inc
 	#include <${1:iostream}>
+snippet binc
+	#include <boost/${1:shared_ptr}.hpp>
 ##
 ## STL Collections
 # std::array