Remove newlines within paras in BUILDING.md which messes up formating in GitHub
Remove newlines within paras in BUILDING.md which messes up formating in GitHub

mjedrzejek/nunit,jadarnel27/nunit,mikkelbu/nunit,mjedrzejek/nunit,NikolayPianikov/nunit,nunit/nunit,appel1/nunit,JustinRChou/nunit,JustinRChou/nunit,OmicronPersei/nunit,NikolayPianikov/nunit,appel1/nunit,nunit/nunit,OmicronPersei/nunit,jadarnel27/nunit,mikkelbu/nunit