travis: PHP 7.0 nightly added + cleanup
travis: PHP 7.0 nightly added + cleanup

`--dev` is by default for couple of months
yaoshanliang/entrust,yaoshanliang/entrust,acabin/entrust,Jacq/entrust,akshayagarwal/entrust,vigneshpalanivel/entrust,leon19910505/entrusts,moura137/entrust,Zizaco/entrust,AndresRojasIsaza/entrust,proshore/entrust-lumen,pathirana/entrust,rhwilrForks/entrust,proshore/entrust-lumen,shraddhabanerjee/entrust,vigneshpalanivel/entrust,bramburn/entrust,buiphu/entrust,peshkov3/entrust,emunshi/entrust,FireEngineRed/entrust,leon19910505/entrusts,danielgelling/entrust,taohaoge/entrust,moura137/entrust,Zizaco/entrust,dezon/entrust,philip8728/entrust,jarbitlira/entrust