Merge branch 'develop' into feature/compat/push-subscriptions

# Conflicts:
#	lib/pleroma/application.ex
#	lib/pleroma/plugs/oauth_plug.ex

mix.exs

@@ -56,6 +56,7 @@ defmodule Pleroma.Mixfile do
       {:calendar, "~> 0.17.4"},
       {:cachex, "~> 3.0.2"},
       {:httpoison, "~> 1.2.0"},
+      {:tesla, "~> 1.2"},
       {:jason, "~> 1.0"},
       {:mogrify, "~> 0.6.1"},
       {:ex_aws, "~> 2.0"},