Streaming media item creation during indexing (#49)

* Implemented streaming during indexing

* Updated file watcher to enqueue download; refactored download worker methods

* Updated File Follower Server timeout

lib/pinchflat/utils/filesystem_utils.ex

@@ -0,0 +1,23 @@
+defmodule Pinchflat.Utils.FilesystemUtils do
+  @moduledoc """
+  Utility methods for working with the filesystem
+  """
+
+  alias Pinchflat.Utils.StringUtils
+
+  @doc """
+  Generates a temporary file and returns its path. The file is empty and has the given type.
+  Generates all the directories in the path if they don't exist.
+
+  Returns binary()
+  """
+  def generate_metadata_tmpfile(type) do
+    tmpfile_directory = Application.get_env(:pinchflat, :tmpfile_directory)
+    filepath = Path.join([tmpfile_directory, "#{StringUtils.random_string(64)}.#{type}"])
+
+    :ok = File.mkdir_p!(Path.dirname(filepath))
+    :ok = File.write(filepath, "")
+
+    filepath
+  end
+end