add a way to push our VC onto the 2nd level
add a way to push our VC onto the 2nd level

I found this was necessary for testing the fix for #1174 & #257, so I thought it might be a handy feature to have in the demo app

TelmedIQ/JSQMessagesViewController,Creolophus/JSQMessagesViewController,adozenlines/JSQMessagesViewController,WhisperSystems/JSQMessagesViewController,derekjcarter/JSQMessagesViewController,derekjcarter/JSQMessagesViewController,mtxs007/JSQMessagesViewController,switchapp/JSQMessagesViewController,TeletronicsDotAe/JSQMessagesViewController,cantinac/JSQMessagesViewController,Vilyan01/JSQMessagesViewController,antonypoderechin/JSQMessagesViewController,khaledalissa/JSQMessagesViewController,GianniCarlo/JSQMessagesViewController,cheskapac/JSQMessagesViewController,preeo/JSQMessagesViewController,simpleg/JSQMessagesViewController,sebastianludwig/JSQMessagesViewController,fhchina/JSQMessagesViewController,eliburke/JSQMessagesViewController,perpetio/JSQMessagesViewController,Lucashuang0802/JSQMessagesViewController,walsh2000/JSQMessagesViewController,tomus85/JSQMessagesViewController,jessesquires/JSQMessagesViewController,WhisperSystems/JSQMessagesViewController,krapuemman/JSQMessagesViewController,jessesquires/JSQMessagesViewController,TeletronicsDotAe/JSQMessagesViewController,pomu0325/JSQMessagesViewController,preeo/JSQMessagesViewController,HelloZhu/JSQMessagesViewController,sevear/JSQMessagesViewController,cantinac/JSQMessagesViewController,adozenlines/JSQMessagesViewController,giacatlaoboi/JSQMessagesViewController,GuyKahlon/JSQMessagesViewController,perpetio/JSQMessagesViewController,GianniCarlo/JSQMessagesViewController,bestwpw/JSQMessagesViewController,shenyuan000/JSQMessagesViewController,sviatoslav/JSQMessagesViewController,XiaoYulong/JSQMessagesViewController,adozenlines/JSQMessagesViewController,hwaxxer/JSQMessagesViewController,vmvinothkumargithub/JSQMessagesViewController,rarejob/JSQMessagesViewController,Insfgg99x/JSQMessagesViewController,k214k/JSQMessagesViewController,ERussel/JSQMessagesViewController,cheskapac/JSQMessagesViewController,sebastianludwig/JSQMessagesViewController,eeschimosu/JSQMessagesViewController,yarneo/JSQMessagesViewController,lzpfmh/JSQMessagesViewController,d-ice/JSQMessagesViewController,TeletronicsDotAe/JSQMessagesViewController,KJin99/JSQMessagesViewController,kohtenko/JSQMessagesViewController,qingsong-xu/JSQMessagesViewController,ZhuGongpu/JSQMessagesViewController,perpetio/JSQMessagesViewController,chanchaiI/JSQMessagesViewController,TransitApp/JSQMessagesViewController,Lucashuang0802/JSQMessagesViewController,mabuward90/JSQMessagesViewController,sebastianludwig/JSQMessagesViewController,meetizer/JSQMessagesViewController,derekjcarter/JSQMessagesViewController,preeo/JSQMessagesViewController,godLoveLucifer/JSQMessagesViewController,iEdward/JSQMessagesViewController,Lucashuang0802/JSQMessagesViewController,iosdevvivek/JSQMessagesViewController,funkyV/JSQMessagesViewController,boland25/jsqmessage,yiShanXin/JSQMessagesViewController,zeptolee/JSQMessagesViewController,ernestopino/JSQMessagesViewController,WeaponJ/JSQMessagesViewController