fix ClassNotFounds, upgrade selenium, config log4j properly and update http client config.

Hi there,

I am a Salesforce new hire, I am doing the Aura-101 exercise and got some issues.
Run any AuraNoteUITestCase in my eclipse/ubuntu/machine throws ClassNotFoundException.
1) First one related to ios-client
2) And after fix the previous one, related to http-client

So I made some changes in pom.xml
1) Add 2 dependencies to fix the ClassNotFounds.
2) Upgrade selenium version.
3) Move all selenium dependencies to test scope. 

The JettyTestServletConfig was using a deprecated HttpClient API, so I made some changes to use the new one.

During the test executions, the Log4j was printing a warning to config it properly.
So I created a log4j properties in test resources.

That's it. I hope this will be helpful.

Thank you,
Gabriel