Added web-based X11 environment.

X11Web/Dockerfile

X11Web/build.sh

X11Web/files/index.html

X11Web/files/noVNC.tar.gz

X11Web/files/run_novnc.sh

X11Web/files/run_vnc.sh

X11Web/files/supervisord.conf

X11Web/files/supervisord_novnc.conf

X11Web/files/supervisord_vnc.conf

X11Web/files/tigervnc-1.8.0.x86_64.tar.gz

X11Web/files/xstartup

X11Web/metauser_home/.Xauthority

X11Web/metauser_home/.bash_logout

X11Web/metauser_home/.bashrc

X11Web/metauser_home/.fehbg

X11Web/metauser_home/.fluxbox/apps

X11Web/metauser_home/.fluxbox/init

X11Web/metauser_home/.fluxbox/keys

X11Web/metauser_home/.fluxbox/lastwallpaper

X11Web/metauser_home/.fluxbox/menu