adds senders to database and firebase connect

- senders, which now have a firebase token
  are added as their own table in the database
- firebase token api call added, which allows
  a user to connect a sender id to a firebase token
- firebase library not yet connected to the saved
  firebase tokens

lib/bump_web/controllers/message_controller.ex

@@ -2,6 +2,7 @@ defmodule BumpWeb.MessageController do
   use BumpWeb, :controller
 
   alias Bump.Messages
+  alias Bump.Senders
 
   def index(conn, _params) do
     text conn, "Bump Api"
@@ -34,4 +35,9 @@ defmodule BumpWeb.MessageController do
     message = Messages.peek(sender)
     text conn, Jason.encode!(message)
   end
+
+  def firebase(conn, %{"sender" => sender, "token" => token}) do
+    Senders.push(sender, token)
+    text conn, Jason.encode!(%{"status" => "OK"})
+  end
 end

lib/bump_web/controllers/sender_controller.ex

@@ -0,0 +1,10 @@
+defmodule BumpWeb.SenderController do
+  use BumpWeb, :controller
+
+  alias Bump.Senders
+
+  def firebase(conn, %{"sender" => sender, "token" => token}) do
+    Senders.firebase(sender, token)
+    text conn, Jason.encode!(%{"status" => "OK"})
+  end
+end

lib/bump_web/router.ex

@@ -12,6 +12,7 @@ defmodule BumpWeb.Router do
     post "/pop", MessageController, :pop
     post "/list", MessageController, :list
     post "/clear", MessageController, :clear
+    post "/firebase", SenderController, :firebase
   end