Merge pull request #19 from phuong3030/admin-client

Configured - Continuous testing change from spork to spring
user_spec - include custom module
Grape API - stub_athenticate! method added (can't stub to warden(devise) because env is alaways nil (ex: API::V1::User spec type is :request))
Features - authen_helper stub helper in grape api
Features - displayed admin username in header title