adding private network interface to be able to connect to rosbridge website
Fix linking bug.

For some reason the force option on the symmlink wasn't working.
Move index link into glassbot role.

Keep the webserver role general as this is just for glassbot.
Make the webserver role a dep of glassbot role.
Merge pull request #70 from shadow-robot/F_glassbot_web

Making rosbridge website available for glassbot vm