image comparison using imagemagick's compare

first attempt at running huxley on travis-ci

try to run functest build step on travis

moved huxley images back to their original location
working on a selenium based solution in test/selenium, currently generates images in test/selenium/images using selenium (based on Huxleyfile.json)

try to get travis to use xvfb

create the images folder if it doesn't exist

copied reference files into position.  functest.js now generates images in test/selenium/temp

added image comparison to functest.js

attempt to set the version of firefox to match the huxley docker

switching to root mean square error to see how much we're off by

added a threshold so that compare will always report results

update the version of firefox to the correct one

removed the second Xvfb call

might need to set the background color

created a dockerfile for use with the selenium tests that contains imagemagick... the images produced match exactly
commenting out lines used to run functional tests in .travis.yml until I figure out how to get the PNGs off the travis-ci so that I can figure out what's going on

added a "wait" in functest.js to make sure that an element with id="math" is on the page

forgot to start the server on travis