Add RHEL and Ubuntu 15.10 badges
Add RHEL and Ubuntu 15.10 badges

- Reformat table to grow down instead of across.
- Move the introduction to CoreFX to the top of README.md.

shimingsg/corefx,gkhanna79/corefx,Priya91/corefx-1,stone-li/corefx,rahku/corefx,jlin177/corefx,parjong/corefx,krytarowski/corefx,SGuyGe/corefx,Petermarcu/corefx,shmao/corefx,DnlHarvey/corefx,jcme/corefx,dsplaisted/corefx,rahku/corefx,shimingsg/corefx,lggomez/corefx,axelheer/corefx,Petermarcu/corefx,ptoonen/corefx,shimingsg/corefx,kkurni/corefx,Priya91/corefx-1,kkurni/corefx,Jiayili1/corefx,krytarowski/corefx,wtgodbe/corefx,ericstj/corefx,marksmeltzer/corefx,shmao/corefx,benpye/corefx,dhoehna/corefx,nbarbettini/corefx,stephenmichaelf/corefx,yizhang82/corefx,elijah6/corefx,Ermiar/corefx,stone-li/corefx,jlin177/corefx,Chrisboh/corefx,mokchhya/corefx,tstringer/corefx,alexperovich/corefx,parjong/corefx,the-dwyer/corefx,zhenlan/corefx,elijah6/corefx,alexperovich/corefx,JosephTremoulet/corefx,mmitche/corefx,mmitche/corefx,shimingsg/corefx,kkurni/corefx,alexperovich/corefx,mmitche/corefx,manu-silicon/corefx,JosephTremoulet/corefx,weltkante/corefx,shahid-pk/corefx,stephenmichaelf/corefx,ViktorHofer/corefx,weltkante/corefx,elijah6/corefx,manu-silicon/corefx,seanshpark/corefx,cartermp/corefx,shmao/corefx,Ermiar/corefx,YoupHulsebos/corefx,yizhang82/corefx,twsouthwick/corefx,krk/corefx,benjamin-bader/corefx,mmitche/corefx,JosephTremoulet/corefx,ravimeda/corefx,elijah6/corefx,jhendrixMSFT/corefx,parjong/corefx,cartermp/corefx,mokchhya/corefx,benpye/corefx,weltkante/corefx,cydhaselton/corefx,manu-silicon/corefx,alphonsekurian/corefx,fgreinacher/corefx,jhendrixMSFT/corefx,rjxby/corefx,benpye/corefx,tstringer/corefx,nchikanov/corefx,mmitche/corefx,ravimeda/corefx,rahku/corefx,seanshpark/corefx,twsouthwick/corefx,richlander/corefx,yizhang82/corefx,ViktorHofer/corefx,Ermiar/corefx,stone-li/corefx,YoupHulsebos/corefx,stephenmichaelf/corefx,lggomez/corefx,nchikanov/corefx,zhenlan/corefx,cydhaselton/corefx,alexperovich/corefx,jhendrixMSFT/corefx,Chrisboh/corefx,alphonsekurian/corefx,Priya91/corefx-1,cartermp/corefx,kkurni/corefx,shmao/corefx,richlander/corefx,the-dwyer/corefx,DnlHarvey/corefx,krytarowski/corefx,dotnet-bot/corefx,benpye/corefx,billwert/corefx,Jiayili1/corefx,twsouthwick/corefx,cydhaselton/corefx,mazong1123/corefx,benpye/corefx,twsouthwick/corefx,seanshpark/corefx,stone-li/corefx,rubo/corefx,khdang/corefx,alphonsekurian/corefx,nbarbettini/corefx,pallavit/corefx,fgreinacher/corefx,zhenlan/corefx,stephenmichaelf/corefx,lggomez/corefx,tijoytom/corefx,jlin177/corefx,rahku/corefx,mokchhya/corefx,rjxby/corefx,rjxby/corefx,Jiayili1/corefx,Petermarcu/corefx,iamjasonp/corefx,yizhang82/corefx,stone-li/corefx,mazong1123/corefx,zhenlan/corefx,pallavit/corefx,Chrisboh/corefx,ravimeda/corefx,krytarowski/corefx,JosephTremoulet/corefx,the-dwyer/corefx,parjong/corefx,shmao/corefx,wtgodbe/corefx,rubo/corefx,iamjasonp/corefx,krk/corefx,elijah6/corefx,dotnet-bot/corefx,lggomez/corefx,dhoehna/corefx,axelheer/corefx,dotnet-bot/corefx,wtgodbe/corefx,ravimeda/corefx,richlander/corefx,MaggieTsang/corefx,cydhaselton/corefx,dotnet-bot/corefx,alexperovich/corefx,gkhanna79/corefx,pallavit/corefx,ellismg/corefx,tijoytom/corefx,jlin177/corefx,elijah6/corefx,weltkante/corefx,shimingsg/corefx,krytarowski/corefx,JosephTremoulet/corefx,mmitche/corefx,gkhanna79/corefx,adamralph/corefx,cydhaselton/corefx,SGuyGe/corefx,YoupHulsebos/corefx,benjamin-bader/corefx,MaggieTsang/corefx,mazong1123/corefx,shahid-pk/corefx,cydhaselton/corefx,stephenmichaelf/corefx,gkhanna79/corefx,dhoehna/corefx,lggomez/corefx,richlander/corefx,gkhanna79/corefx,rubo/corefx,billwert/corefx,kkurni/corefx,shahid-pk/corefx,yizhang82/corefx,JosephTremoulet/corefx,jhendrixMSFT/corefx,krytarowski/corefx,rahku/corefx,axelheer/corefx,marksmeltzer/corefx,billwert/corefx,krk/corefx,dhoehna/corefx,ViktorHofer/corefx,cartermp/corefx,axelheer/corefx,jcme/corefx,yizhang82/corefx,ViktorHofer/corefx,JosephTremoulet/corefx,dhoehna/corefx,DnlHarvey/corefx,nbarbettini/corefx,zhenlan/corefx,ericstj/corefx,tstringer/corefx,Jiayili1/corefx,krk/corefx,ptoonen/corefx,ericstj/corefx,benjamin-bader/corefx,mokchhya/corefx,nbarbettini/corefx,rjxby/corefx,dotnet-bot/corefx,MaggieTsang/corefx,YoupHulsebos/corefx,dsplaisted/corefx,billwert/corefx,YoupHulsebos/corefx,marksmeltzer/corefx,ViktorHofer/corefx,nchikanov/corefx,shimingsg/corefx,stephenmichaelf/corefx,iamjasonp/corefx,weltkante/corefx,manu-silicon/corefx,tijoytom/corefx,shahid-pk/corefx,YoupHulsebos/corefx,gkhanna79/corefx,shmao/corefx,BrennanConroy/corefx,billwert/corefx,kkurni/corefx,manu-silicon/corefx,MaggieTsang/corefx,nchikanov/corefx,Petermarcu/corefx,richlander/corefx,jlin177/corefx,wtgodbe/corefx,Jiayili1/corefx,tstringer/corefx,dotnet-bot/corefx,alexperovich/corefx,mazong1123/corefx,manu-silicon/corefx,stone-li/corefx,SGuyGe/corefx,dotnet-bot/corefx,rahku/corefx,rubo/corefx,zhenlan/corefx,ellismg/corefx,ericstj/corefx,benjamin-bader/corefx,marksmeltzer/corefx,manu-silicon/corefx,seanshpark/corefx,wtgodbe/corefx,Petermarcu/corefx,gkhanna79/corefx,yizhang82/corefx,seanshpark/corefx,elijah6/corefx,nbarbettini/corefx,parjong/corefx,YoupHulsebos/corefx,jcme/corefx,krk/corefx,Petermarcu/corefx,the-dwyer/corefx,jcme/corefx,cartermp/corefx,wtgodbe/corefx,marksmeltzer/corefx,ViktorHofer/corefx,ptoonen/corefx,shahid-pk/corefx,adamralph/corefx,dhoehna/corefx,jhendrixMSFT/corefx,twsouthwick/corefx,BrennanConroy/corefx,jhendrixMSFT/corefx,the-dwyer/corefx,rubo/corefx,stone-li/corefx,ellismg/corefx,Priya91/corefx-1,axelheer/corefx,ravimeda/corefx,BrennanConroy/corefx,Ermiar/corefx,shmao/corefx,tijoytom/corefx,seanshpark/corefx,alexperovich/corefx,pallavit/corefx,billwert/corefx,fgreinacher/corefx,Chrisboh/corefx,khdang/corefx,mmitche/corefx,twsouthwick/corefx,ptoonen/corefx,parjong/corefx,krk/corefx,twsouthwick/corefx,Petermarcu/corefx,marksmeltzer/corefx,Jiayili1/corefx,rahku/corefx,nchikanov/corefx,mazong1123/corefx,ptoonen/corefx,rjxby/corefx,shimingsg/corefx,the-dwyer/corefx,stephenmichaelf/corefx,krytarowski/corefx,shahid-pk/corefx,MaggieTsang/corefx,benpye/corefx,richlander/corefx,rjxby/corefx,weltkante/corefx,axelheer/corefx,ravimeda/corefx,mazong1123/corefx,lggomez/corefx,benjamin-bader/corefx,tijoytom/corefx,marksmeltzer/corefx,zhenlan/corefx,Chrisboh/corefx,Ermiar/corefx,ellismg/corefx,mokchhya/corefx,nchikanov/corefx,DnlHarvey/corefx,iamjasonp/corefx,dsplaisted/corefx,MaggieTsang/corefx,ericstj/corefx,tstringer/corefx,adamralph/corefx,tstringer/corefx,jlin177/corefx,richlander/corefx,Priya91/corefx-1,fgreinacher/corefx,ViktorHofer/corefx,cartermp/corefx,Priya91/corefx-1,DnlHarvey/corefx,khdang/corefx,nchikanov/corefx,SGuyGe/corefx,jlin177/corefx,DnlHarvey/corefx,DnlHarvey/corefx,ravimeda/corefx,dhoehna/corefx,benjamin-bader/corefx,Chrisboh/corefx,lggomez/corefx,khdang/corefx,alphonsekurian/corefx,iamjasonp/corefx,Ermiar/corefx,mokchhya/corefx,wtgodbe/corefx,nbarbettini/corefx,alphonsekurian/corefx,SGuyGe/corefx,ptoonen/corefx,Jiayili1/corefx,tijoytom/corefx,Ermiar/corefx,ericstj/corefx,jcme/corefx,weltkante/corefx,nbarbettini/corefx,jhendrixMSFT/corefx,billwert/corefx,pallavit/corefx,alphonsekurian/corefx,ellismg/corefx,ellismg/corefx,MaggieTsang/corefx,krk/corefx,jcme/corefx,pallavit/corefx,alphonsekurian/corefx,mazong1123/corefx,khdang/corefx,iamjasonp/corefx,khdang/corefx,ericstj/corefx,iamjasonp/corefx,parjong/corefx,seanshpark/corefx,cydhaselton/corefx,ptoonen/corefx,SGuyGe/corefx,tijoytom/corefx,the-dwyer/corefx,rjxby/corefx