Add a url keyword or argument to Agent#initialize

[CharlieWWW94]

Adds the url: kwarg to the Ronin::Web::Browers::Agent initializer, as outlined in issue #16. Upon initialization the browser will navigate to this url.

Hope this contribution is useful - did my best to conform to code conventions across the rest of the repo. Please do let me know of any changes that are needed. Eager to contribute in any way that might be helpful 👍

[postmodern]

Minor stylistic changes.

I would also copy/paste the @param tag into lib/ronin/web/browser.rb for the .new method.

Also, if it's not too much work, could you rebase against the 0.2.0 branch? I like to merge new features into the next upcoming minor version branch. Otherwise I can manually merge your branch into 0.2.0.

[CharlieWWW94]

Minor stylistic changes.

I would also copy/paste the @param tag into lib/ronin/web/browser.rb for the .new method.

Also, if it's not too much work, could you rebase against the 0.2.0 branch? I like to merge new features into the next upcoming minor version branch. Otherwise I can manually merge your branch into 0.2.0.

Thanks for the feedback! Have completed those, rebased against 0.2.0 and updated the base branch of the PR to 0.2.0.

[postmodern]

Minor changes. Looks good except for those two things.

[postmodern]

Last request for change I swear! Did some testing to figure out what values go_to actually accepts. Turns out URI::HTTP and anything that Addressable::URI can accept are valid.