#11 Eliminate ICC remarks on Indexing Suite V2

[Jason Kankiewicz]

The absence of access control specifiers on the Indexing Suite V2's container_suite subclasses causes the ICC compiler to output remarks like the following:
.../indexing_suite/map.hpp(166): remark #304: access control not specified ("public" by default)
: container_suite<Container, MethodMask, map_algorithms<Traits> >
^

This annoyance was encountered in revision 1856.