Fix Int32 support (#37)

* Fix small bug at int32 support

* Strange inference bug

* Actually introduce the bug

Author: ranjanan

src/aggregate.jl

@@ -97,12 +97,14 @@ function aggregation(::StandardAggregation, S::SparseMatrixCSC{T,R}) where {T,R}
     if minimum(x) == -1
         mask = x .!= -1
         I = collect(R, 1:n)[mask]
-        J = x[mask] + 1
+        J = x[mask] + R(1)
+        #J = x[mask] + 1
         V = ones(eltype(S), length(J))
         AggOp = sparse(J,I,V,N,M)
     else
         Tp = collect(R, 1:n+1)
-        x .= x .+ 1
+        x .= x .+ R(1)
+        #x .= x .+ 1
         Tx = ones(eltype(S), length(x))
         AggOp = SparseMatrixCSC(N, M, Tp, x, Tx)
     end