Move supplier full pull to being an api for the ember app and handle login and authorization a little bit better (should be even a lot better in the future)

app/controllers/suppliers/sessions_controller.rb

@@ -1,6 +1,15 @@
 class Suppliers::SessionsController < Devise::SessionsController
   respond_to :json
 
+  def create
+    # taken from super except the respond_with
+    self.resource = warden.authenticate!(auth_options)
+    set_flash_message!(:notice, :signed_in)
+    sign_in(resource_name, resource)
+    yield resource if block_given?
+    render json: {employee_id: current_employee.id, auth_token: current_employee.authentication_token}
+  end
+
   def destroy
     session[:supplier_id] = nil
     super