Issue title: Extension Icons missing
 Issue body: <!-- Do you have a question? Please ask it on http://stackoverflow.com/questions/tagged/vscode -->

- VSCode Version: 1.8.1
- OS Version: Windows 10

Steps to Reproduce:

1. Install VS Code with ninite
2. install any extension

<p align="left">
  <img alt="the bug" src="http://i.imgur.com/FsqOS0p.jpg">
</p>

A fresh install of the editor with Ninite results in extensions not having icons.  Clicking any of them to open their pages does show full markdown support, including images.
 Comments: 
 Comment 0: One quick question: if you expand the extension pane, do the icons show or are they always missing? The screenshots seems to show the extensions panel being too narrow to show the icons
 Comment 1: Well, doesn't that make me feel silly...  It was indeed too narrow.
{'source': 'GithubIssues', 'repo_name_with_owner': 'Microsoft/vscode', 'issue_id': 204696557, 'repo_stars': 77599.0}