Add snap-loader-dynamic to Stackage

[rjayatilleka]

Snap and it's direct dependencies are on Stackage, in LTS 2.15 and Nightly 2015-06-24 forward, so I can install them with stack fine. But using stack build on a newly snap init-ed project with the Development flag turned on gives the following error:

--  While attempting to add dependency,
    Could not find package snap-loader-dynamic in known packages

--  While attempting to add dependency,
    Could not find package snap-loader-static in known packages

--  Failure when adding dependencies:    
      snap-loader-dynamic: needed (==0.10.*), but not present in build plan, latest is 0.10.0.3
      snap-loader-static: needed (>=0.9 && <0.10), but not present in build plan, latest is 0.9.0.2
    needed for package: todo-0.1

Can this be added to Stackage nightly's going forward?