add gviz/doc directory and default index.txt file. Fixes ROOT-5396.
add gviz/doc directory and default index.txt file. Fixes ROOT-5396.

sirinath/root,gbitzes/root,sbinet/cxx-root,zzxuanyuan/root-compressor-dummy,evgeny-boger/root,pspe/root,cxx-hep/root-cern,0x0all/ROOT,mkret2/root,esakellari/my_root_for_test,gbitzes/root,Y--/root,mattkretz/root,esakellari/root,jrtomps/root,sawenzel/root,krafczyk/root,esakellari/root,krafczyk/root,gganis/root,georgtroska/root,dfunke/root,CristinaCristescu/root,alexschlueter/cern-root,bbockelm/root,perovic/root,zzxuanyuan/root-compressor-dummy,vukasinmilosevic/root,olifre/root,zzxuanyuan/root-compressor-dummy,mattkretz/root,davidlt/root,simonpf/root,beniz/root,krafczyk/root,Y--/root,Y--/root,agarciamontoro/root,sawenzel/root,krafczyk/root,arch1tect0r/root,nilqed/root,vukasinmilosevic/root,georgtroska/root,perovic/root,abhinavmoudgil95/root,dfunke/root,davidlt/root,Y--/root,mhuwiler/rootauto,thomaskeck/root,sirinath/root,thomaskeck/root,arch1tect0r/root,beniz/root,0x0all/ROOT,sbinet/cxx-root,agarciamontoro/root,simonpf/root,arch1tect0r/root,sawenzel/root,beniz/root,smarinac/root,zzxuanyuan/root,Duraznos/root,omazapa/root-old,karies/root,agarciamontoro/root,0x0all/ROOT,CristinaCristescu/root,mattkretz/root,olifre/root,abhinavmoudgil95/root,olifre/root,gbitzes/root,veprbl/root,alexschlueter/cern-root,zzxuanyuan/root,olifre/root,sbinet/cxx-root,root-mirror/root,Duraznos/root,zzxuanyuan/root,krafczyk/root,alexschlueter/cern-root,omazapa/root-old,dfunke/root,CristinaCristescu/root,buuck/root,cxx-hep/root-cern,davidlt/root,lgiommi/root,evgeny-boger/root,vukasinmilosevic/root,omazapa/root,sirinath/root,evgeny-boger/root,jrtomps/root,arch1tect0r/root,Duraznos/root,georgtroska/root,esakellari/root,esakellari/my_root_for_test,gganis/root,zzxuanyuan/root,beniz/root,bbockelm/root,pspe/root,CristinaCristescu/root,arch1tect0r/root,beniz/root,omazapa/root-old,smarinac/root,mhuwiler/rootauto,satyarth934/root,sbinet/cxx-root,thomaskeck/root,mattkretz/root,abhinavmoudgil95/root,bbockelm/root,pspe/root,abhinavmoudgil95/root,mhuwiler/rootauto,georgtroska/root,agarciamontoro/root,smarinac/root,buuck/root,gganis/root,abhinavmoudgil95/root,karies/root,davidlt/root,evgeny-boger/root,omazapa/root,sbinet/cxx-root,agarciamontoro/root,zzxuanyuan/root,gbitzes/root,simonpf/root,beniz/root,pspe/root,gganis/root,BerserkerTroll/root,mhuwiler/rootauto,smarinac/root,Y--/root,satyarth934/root,davidlt/root,beniz/root,jrtomps/root,simonpf/root,buuck/root,evgeny-boger/root,evgeny-boger/root,esakellari/root,gbitzes/root,root-mirror/root,bbockelm/root,perovic/root,thomaskeck/root,gbitzes/root,sirinath/root,mhuwiler/rootauto,krafczyk/root,sbinet/cxx-root,nilqed/root,krafczyk/root,olifre/root,gbitzes/root,esakellari/root,root-mirror/root,simonpf/root,smarinac/root,gganis/root,zzxuanyuan/root,perovic/root,lgiommi/root,jrtomps/root,arch1tect0r/root,zzxuanyuan/root,beniz/root,dfunke/root,olifre/root,mattkretz/root,Y--/root,buuck/root,mkret2/root,beniz/root,thomaskeck/root,root-mirror/root,perovic/root,davidlt/root,buuck/root,georgtroska/root,sawenzel/root,sirinath/root,arch1tect0r/root,Duraznos/root,georgtroska/root,dfunke/root,cxx-hep/root-cern,vukasinmilosevic/root,karies/root,smarinac/root,0x0all/ROOT,simonpf/root,karies/root,esakellari/my_root_for_test,sbinet/cxx-root,gganis/root,Y--/root,Duraznos/root,satyarth934/root,zzxuanyuan/root-compressor-dummy,dfunke/root,arch1tect0r/root,abhinavmoudgil95/root,Duraznos/root,BerserkerTroll/root,olifre/root,veprbl/root,BerserkerTroll/root,esakellari/my_root_for_test,omazapa/root,nilqed/root,nilqed/root,pspe/root,sbinet/cxx-root,sbinet/cxx-root,smarinac/root,Y--/root,evgeny-boger/root,buuck/root,perovic/root,satyarth934/root,vukasinmilosevic/root,jrtomps/root,CristinaCristescu/root,simonpf/root,jrtomps/root,mkret2/root,evgeny-boger/root,pspe/root,lgiommi/root,krafczyk/root,alexschlueter/cern-root,nilqed/root,bbockelm/root,pspe/root,vukasinmilosevic/root,pspe/root,esakellari/root,mattkretz/root,BerserkerTroll/root,lgiommi/root,jrtomps/root,alexschlueter/cern-root,omazapa/root-old,zzxuanyuan/root,mhuwiler/rootauto,0x0all/ROOT,krafczyk/root,simonpf/root,root-mirror/root,vukasinmilosevic/root,agarciamontoro/root,davidlt/root,root-mirror/root,jrtomps/root,satyarth934/root,perovic/root,davidlt/root,thomaskeck/root,gbitzes/root,satyarth934/root,davidlt/root,abhinavmoudgil95/root,zzxuanyuan/root,dfunke/root,CristinaCristescu/root,mhuwiler/rootauto,zzxuanyuan/root,gganis/root,sbinet/cxx-root,beniz/root,gganis/root,mhuwiler/rootauto,sawenzel/root,Duraznos/root,0x0all/ROOT,zzxuanyuan/root-compressor-dummy,buuck/root,omazapa/root-old,georgtroska/root,sawenzel/root,davidlt/root,esakellari/root,veprbl/root,karies/root,mkret2/root,0x0all/ROOT,esakellari/root,satyarth934/root,gganis/root,karies/root,CristinaCristescu/root,omazapa/root,Duraznos/root,esakellari/my_root_for_test,evgeny-boger/root,jrtomps/root,satyarth934/root,sawenzel/root,CristinaCristescu/root,perovic/root,BerserkerTroll/root,perovic/root,lgiommi/root,gganis/root,nilqed/root,mkret2/root,abhinavmoudgil95/root,buuck/root,cxx-hep/root-cern,karies/root,sirinath/root,olifre/root,dfunke/root,thomaskeck/root,mhuwiler/rootauto,CristinaCristescu/root,BerserkerTroll/root,simonpf/root,lgiommi/root,vukasinmilosevic/root,nilqed/root,veprbl/root,veprbl/root,root-mirror/root,omazapa/root,gbitzes/root,olifre/root,zzxuanyuan/root,sirinath/root,georgtroska/root,bbockelm/root,omazapa/root,thomaskeck/root,zzxuanyuan/root-compressor-dummy,karies/root,0x0all/ROOT,cxx-hep/root-cern,agarciamontoro/root,jrtomps/root,BerserkerTroll/root,mattkretz/root,mhuwiler/rootauto,simonpf/root,omazapa/root,esakellari/my_root_for_test,zzxuanyuan/root,Y--/root,karies/root,arch1tect0r/root,omazapa/root-old,krafczyk/root,dfunke/root,agarciamontoro/root,georgtroska/root,karies/root,lgiommi/root,satyarth934/root,omazapa/root,esakellari/my_root_for_test,lgiommi/root,beniz/root,agarciamontoro/root,olifre/root,BerserkerTroll/root,Y--/root,mkret2/root,thomaskeck/root,arch1tect0r/root,veprbl/root,bbockelm/root,esakellari/my_root_for_test,perovic/root,smarinac/root,Y--/root,perovic/root,pspe/root,sawenzel/root,zzxuanyuan/root-compressor-dummy,mkret2/root,evgeny-boger/root,root-mirror/root,abhinavmoudgil95/root,smarinac/root,thomaskeck/root,mkret2/root,dfunke/root,Duraznos/root,omazapa/root-old,jrtomps/root,bbockelm/root,mattkretz/root,olifre/root,esakellari/root,nilqed/root,zzxuanyuan/root-compressor-dummy,omazapa/root-old,nilqed/root,veprbl/root,alexschlueter/cern-root,sirinath/root,smarinac/root,georgtroska/root,krafczyk/root,omazapa/root-old,CristinaCristescu/root,mattkretz/root,cxx-hep/root-cern,BerserkerTroll/root,arch1tect0r/root,veprbl/root,esakellari/my_root_for_test,mattkretz/root,esakellari/root,omazapa/root-old,zzxuanyuan/root-compressor-dummy,pspe/root,omazapa/root-old,satyarth934/root,sbinet/cxx-root,omazapa/root,CristinaCristescu/root,lgiommi/root,buuck/root,dfunke/root,omazapa/root,abhinavmoudgil95/root,lgiommi/root,agarciamontoro/root,buuck/root,esakellari/root,omazapa/root,BerserkerTroll/root,BerserkerTroll/root,Duraznos/root,veprbl/root,abhinavmoudgil95/root,davidlt/root,mkret2/root,sawenzel/root,mkret2/root,vukasinmilosevic/root,nilqed/root,veprbl/root,root-mirror/root,satyarth934/root,buuck/root,vukasinmilosevic/root,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root-compressor-dummy,cxx-hep/root-cern,bbockelm/root,sirinath/root,sirinath/root,alexschlueter/cern-root,esakellari/my_root_for_test,veprbl/root,root-mirror/root,sawenzel/root,mattkretz/root,cxx-hep/root-cern,0x0all/ROOT,bbockelm/root,simonpf/root,bbockelm/root,gbitzes/root,sirinath/root,karies/root,georgtroska/root,evgeny-boger/root,vukasinmilosevic/root,root-mirror/root,gbitzes/root,sawenzel/root,agarciamontoro/root,lgiommi/root,gganis/root,Duraznos/root,mhuwiler/rootauto,nilqed/root,mkret2/root,pspe/root