curl -v -H "Accept: application/json" -H "Content-type: application/json" -X POST -d ' {"user":   {"email":"EgorkZe@gmail.com","password":"1234"}}'  http://127.0.0.1:3000/users/sign_in

session = 654a8f9be39839e0eac5b06c7224d671;
success = 1;
user =     {
    "authentication_token" = "<null>";
    "created_at" = "2014-04-10T08:54:28.813Z";
    email = "egorkze@gmail.com";
    id = 1;
    "server_id" = "<null>";
    "updated_at" = "2014-04-11T07:27:23.580Z";
};

class SessionsController < Devise::SessionsController
    skip_before_filter :verify_authenticity_token, only: [:show, :create, :edit, :update, :destroy]

  def create

    resource = warden.authenticate!(:scope => resource_name, :recall => "sessions#failure")
    sign_in(resource_name, resource)

    respond_to do | format |
      format.json { render :json => { :success => true, :user => resource ,:session => session['session_id']}, :status => 200 }
    end

  end

  def failure
    respond_to do | format |
      format.json { render :status => 401, :json => {:success => false, :errors => ["Login failed."]} }
    end

  end
end

-b "session=654a8f9be39839e0eac5b06c7224d671"