Laravel 5.1 fix
Laravel 5.1 fix

Switch deprecated "bindShared" with "singleton".
pathirana/entrust,proshore/entrust-lumen,rhwilrForks/entrust,yaoshanliang/entrust,leon19910505/entrusts,dezon/entrust,buiphu/entrust,vigneshpalanivel/entrust,philip8728/entrust,danielgelling/entrust,moura137/entrust,taohaoge/entrust,acabin/entrust,Zizaco/entrust,peshkov3/entrust,moura137/entrust,FireEngineRed/entrust,vigneshpalanivel/entrust,yaoshanliang/entrust,AndresRojasIsaza/entrust,proshore/entrust-lumen,Zizaco/entrust,leon19910505/entrusts,bramburn/entrust,emunshi/entrust,shraddhabanerjee/entrust