Add args to create_proxy

[sarahethompson]

Add the ability to send args to the POST method.

This enables the ability to set :trustAllServers => true.

Sample usage from ruby class:

@proxy_binary.create_proxy(80, { :trustAllServers => true })

[sarahethompson]

Looks like the travis build is trying to unzip a non-existent browsermob-proxy binary.

[jarib]

Thanks for the PR. I don't really maintain this library any more, and haven't touched the code since 2014.

I've made an attempt to fix the Travis build on master (upgraded the proxy, the dev dependency on selenium-webdriver to 3.7 and added Geckodriver), but I'm seeing several test failures that I don't have the capacity to look into right now.

If you (or anyone else) want to submit a PR that fixes the tests, I'll be happy to merge this PR and release a new gem.

@p0deje @titusfortner If you're interested in contributing a fix or take over the maintenance of this gem, let me know.

[p0deje]

I've never used BrowserMob so I'm definitely not the best person to maintain 😄

[sarahethompson]

@jarib I can definitely look at the failed tests on travis.

[rriemann]

Any news?