Download images for sources (#96)

* [WIP] hooked up photo downloading to source metadata worker

* Added new attributes for source images

* Added option to profile form

lib/pinchflat/filesystem/filesystem_helpers.ex

@@ -34,6 +34,19 @@ defmodule Pinchflat.Filesystem.FilesystemHelpers do
     File.write!(filepath, content, modes)
   end
 
+  @doc """
+  Copies a file from source to destination, creating directories as needed.
+
+  Returns :ok | raises on error
+  """
+  def cp_p!(source, destination) do
+    destination
+    |> Path.dirname()
+    |> File.mkdir_p!()
+
+    File.cp!(source, destination)
+  end
+
   @doc """
   Fetches the file size of a media item and saves it to the database.