move remainder of env.py into here as it's clearer and this is where the webapp goes.
update to latest submodules; delete now unused env.py
update to latest tf-utils submodule
remove customerio from lib b/c now it's a submodule
added new logos and links to the employer network page
fixed broken links on employer network page
updated copy on time commitment
changed press logos to new version as per results of AB test and centered them
Merge branch 'master' into homepage-additions
made image files of press logos smaller, centered them for real this time, updated copy to match real # of employer network companes
updated wsj image so it would anti-alias better
added fb and twitter icons to footer