Beginning Work on BasicCompanionAdTest.java
##Rationale
Now that Companion Ads have been implemented into the Sample App, tests needs to be written for them.
##Changed Files
BasicCompanionAdTest.java
* new class UiObject **companionAd** to represent the companion ad
* new boolean utility method **companionCheck** that checks the pressence of the companion ad and returns true or false depending on the presence of the companion ad.
* new test method **testCompanionAd** that tests for the presence of the actual companion ad image
* new test method **testCompanionAdLink** that does a click on the companion ad after it appears and checks if the appropriate browser link appears as text
* new test method **testCompanionAdVanish** that tests for the companion ad disappearing after an ad break concludes.