jsroot: remove example.htm, it will go into demo directory (not in repository)

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>
jsroot: improve index.htm, add 'path' parameter to select location of available files

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>
jsroot: implement TCutG painter

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>
jsroot: improve TH2 drawing

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>
jsroot: Introduce central JSROOT.Create() method to instantiate all supported ROOT classes

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>