Switch to sqlite (#22)

* Updated project to use sqlite

* Edited migrations directly because I fear no man

* Updated search functions and tests to work with sqlite

* Updated build tools to remove postgres

test/support/data_case.ex

@@ -32,20 +32,6 @@ defmodule Pinchflat.DataCase do
 
   setup tags do
     Pinchflat.DataCase.setup_sandbox(tags)
-    Pinchflat.DataCase.setup_temp_filepaths()
-    :ok
-  end
-
-  @doc """
-  Sets up the temp filepaths for the media and metadata directories.
-  """
-  def setup_temp_filepaths do
-    File.rm_rf!(Application.get_env(:pinchflat, :media_directory))
-    File.rm_rf!(Application.get_env(:pinchflat, :metadata_directory))
-
-    File.mkdir_p!(Application.get_env(:pinchflat, :media_directory))
-    File.mkdir_p!(Application.get_env(:pinchflat, :metadata_directory))
-
     :ok
   end