Clytwynec/post hars to harstorage

@cgoldberg @benpatterson @jzoldak  Please review.
module imports should be done in 3 sections (newline between each)...
in alphabetical order within each section.
- standard lib modules
- external/dependency modules
- internal modules/package

for example:
import argparse
import json
import logging
import re
import os
import time
import yaml

from browsermobproxy import Server
from pyvirtualdisplay import Display
from selenium import webdriver

from haruploader import upload_hars