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/conn_case.ex

@@ -34,7 +34,6 @@ defmodule PinchflatWeb.ConnCase do
 
   setup tags do
     Pinchflat.DataCase.setup_sandbox(tags)
-    Pinchflat.DataCase.setup_temp_filepaths()
     {:ok, conn: Phoenix.ConnTest.build_conn()}
   end
 end