Add screenshot.js file to scripts
This script is used to connect to Selenium on Sauce using `wd` (a
webdriver for Selenium). This was the first webdriver that we came
across it seems to be feature complete, but the standard webdriver for
Selenium is http://webdriver.io/. The variable `browserVersions is the list of browsers that screenshots will be taken for.
This script assumes the following:
1. You've installed wd with `npm install wd'.
2. You've set the environment variables $SAUCE_USERNAME and $SAUCE_ACCESS_KEY.
3. If the environment variable $CIRCLE_ARTIFACTS is not set imanges will be saved in /tmp
The intention of this script is that it will be ran from CircleCI
Example usage:
node screenshots.js http://localhost:9292/test/visual.html
node screenshots.js http://google.com
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