v0.3.0 - Initial Support For nody-greeter / web-greeter 3.0

This is the first release to support nody-greeter and web-greeter 3.0 instead of lightdm-webkit2-greeter.
The majority of changes here are to support the new greeters and fix some small issues that emerged due to the updated API and HTML/JS engines; however, there is also a fix for a major formatting issue if you happen to have many accounts on your system.