Issue title: Unsupported Emojis on linux
 Issue body: Operation System: Linux (Debian XFCE)
Beaker version: 0.8.0 Electron: 3.0.4 - Chromium: (701)670-2134 - Node: 10.2.0

Emojis appears correctly in any browser I use except in Beaker where I have for most of it, the empty rectangle glyph.
![screenshot_2018-11-26_15-42-02](https://user-images.githubusercontent.com/193122/49020950-e20f3700-f191-11e8-97e3-5cdcf5825c92.png)
Tested with the hole emoji "🕳" for exemple.


 Comments: 
 Comment 0: Thanks for filing. We should check if this is a known issue with Electron.
 Comment 1: Hello, I just got back to the issue and it now works for me too! I don’t really know how the issue solved itself on my system. Closing. Thank you !
{'source': 'GithubIssues', 'repo_name_with_owner': 'beakerbrowser/beaker', 'issue_id': 384361770, 'repo_stars': 6631.0}