FRC Toolchain for linux on Ubuntu 16.04 Xenial

[fidel1029]

This was actually a rather easy fix. You just have to change the source file in /etc/apt/sources.d/
Steps:
1. sudo nano /etc/apt/sources.list.d/wpilib-ubuntu-toolchain-xenial.list (use tab to autocomplete)
2. change out where it says 'xenial' (without the apostrophes) and replace it with 'trusty' (also without the apostrophes)
3. sudo apt-get update

This makes the machine pretend to be running 14.04 for only that one source. Worked for my team's machine.