Change favicon

Invert favicon to make it larger and remove the black background
Add dummy time text to post
Add time since content was posted
Change links in readme to beta.fraction.io instead of demo.fraction.io

This isn't a demo anymore, it's a fully functioning beta. YEAH.
Fix sign up

The sign up link was previously pointing to sign-in, which was a bit disheartening. :(
Merge pull request #85 from christianbundy/change-favicon

Change favicon
Merge pull request #84 from christianbundy/beta-instead-of-demo

Change links in readme to beta.fraction.io instead of demo.fraction.io
Merge pull request #83 from christianbundy/fix-sign-up

Fix sign up
Clean up function from SO and "use strict" everywhwere
Merge pull request #82 from christianbundy/add-time

Add time