FireFox supports range sliders as of version 23

Volume bar uses "-webkit-appearance: slider-vertical;" , but FF doesn't support it. Firefox support orient="vertical".

Also check: http://stackoverflow.com/questions/15935837/how-to-display-a-range-input-vertically
Merge pull request #89 from peili/patch-2

 FireFox supports range sliders as of version 23
Fixed media part of travisDeps
Added unattended installation script for Ubuntu
Fixed unattended script
Added configuration for public erizoController IP
switched undefined for ''
Added vagrant configuration files for development
Fixed error when publicIP is undefined
Switched to queue + sendLoop in another thread
Removed traces