Modify default call to map/pmap when paralellizing

This addresses the discussion in Circuitscape#236.

src/core.jl

@@ -218,7 +218,12 @@ function amg_solver_path(data::GraphData{T,V}, flags, cfg, log)::Matrix{T} where
             f(1)
             update_shortcut_resistances!(idx, shortcut, resistances, points, comp)
         else
-            X = pmap(x ->f(x), 1:size(csub,1))
+            is_parallel = cfg["parallelize"] in TRUELIST
+            if is_parallel
+                X = pmap(x ->f(x), 1:size(csub,1))
+            else
+                X = map(x ->f(x), 1:size(csub,1))
+            end
 
             # Set all resistances
             for x in X
@@ -417,8 +422,13 @@ function _cholmod_solver_path(data::GraphData{T,V}, flags,
                 end
             end
 
-
-            pmap(x -> f(x, rng, lhs), 1:length(rng))
+            is_parallel = cfg["parallelize"] in TRUELIST
+            if is_parallel
+                X = pmap(x -> f(x, rng, lhs), 1:length(rng))
+            else
+                X = map(x -> f(x, rng, lhs), 1:length(rng))
+            end
+
             for (i,v) in enumerate(rng)
                 coords = cholmod_batch[v].points_idx
                 r = lhs[cholmod_batch[v].cc_idx[2], i] -