Shuffle files and functions around for more consistent naming and smaller files

src/node/create.jl

@@ -0,0 +1,23 @@
+function make_node(t::AbstractTask)
+   error("Cannot make a node from this task type")
+end
+
+function make_node(t::AbstractDataTask)
+   return DataTaskNode(t)
+end
+
+function make_node(t::AbstractComputeTask)
+   return ComputeTaskNode(t)
+end
+
+function make_edge(n1::Node, n2::Node)
+   error("Can only create edges from compute to data node or reverse")
+end
+
+function make_edge(n1::ComputeTaskNode, n2::DataTaskNode)
+   return Edge((n1, n2))
+end
+
+function make_edge(n1::DataTaskNode, n2::ComputeTaskNode)
+   return Edge((n1, n2))
+end