Somebody would just want to defer context creation after parsing
arguments or doing some validations without any particular setup, thus
having to write even the {} is annoying.
Sdl2Application is now taken as base implementation (it was GLUT
previously) and all others are copying/referencing the documentation
from it. When SDL2 is included in all major distributions (Ubuntu, I'm
looking at you), it will replace GLUT as the default application.
The page now displays download progress, last error and also hints to
the user that JS console might contain something useful. NaClApplication
and WindowlessNaClApplication documentation has been updated with brief
"bootstrap guide".