Ubuntu install script

Summary:
Simple script to install dependencies on Ubuntu.

There's probably lots of room for improvement here.

Test Plan:
Imaged a clean Ubuntu box in EC2 and ran this script, it appeared to work?

Reviewed By: tuomaspelkonen
Reviewers: kevinwallace, jungejason, tuomaspelkonen, aran
Commenters: aran
CC: moskov, aran, tuomaspelkonen, epriestley
Differential Revision: 384