Displays download counter for each attachment from 'Releases' page on GitHub.com

Discontinued (2019.01.07): GitHubReleasesCount has been replaced by the new GhrMeter:

• https://github.com/3F/GhrMeter.user.js

GhrMeter continues GitHubReleasesCount mission, still under the MIT license.

Please use github issue tracker if you have problem or question.