Add an optional Chrome Extension CRX file to the file capabilities of th...

[eliseosoto]

...e agent to be created.

Fixes #113

[zacharyc]

I've spoken with Eliseo and we are on the same page. This approach is a little confusing. Firstly, by specifying the CRX file with the agent we are confusing the issue.

• Can tests still be run on this agent if they require using the normal browser without the extension?
• There is no way to indicate which CRX is on which agent
• Tests are written with the CRX in mind, we feel the CRX information should be stored on the test

All of these concerns aside, the approach that Eliseo has taken is the quickest and should at least allow our customers to find a way way test a CRX. We should rethink this interface in the future.