New Template Class UiAutomatorBaseTest, repurposed UiAutomatorTest, Finalized LearnMoreCheck

##Rationale
Now that work has begun, and a test class is reaching finalization, I wanted to provide a way to get the universal setUp and tearDown methods to each class without having to literally copy and paste them across each class file. This is where UiAutomatorBaseTest comes into play. All further tests will now extend from it, calling down the super.setUp and super.tearDown methods. For now, LearnMoreCheck is the only test that is finalized. The rest of the test classes are outlined with test ideas that I would appreciate any feedback on.

##Changed Files
UiAutomatorBaseTest.java
* Created, copied over the methods from UiAutomatorTest.java
* added javadoc comments.
UiAutomatorTest.java
* in depth explanation of setup and teardown removed
* superclass changed to UiAutomatorBaseTest
* added test method testCheckForSampleApp that verifies the setUp method is successful.
* added TODO that outlines future tests.
* added javadoc comments.
LearnMoreCheck.java
* setUp and tearDown methods reduced to incorporate the new system.
* removed one of the clicks at 500, 500 from playVideo utility method as it can cause some issues, and one click is all that is required.
* changed waiting periods for assertions to be much shorter, so that tests do not wait inordinate amounts of time before telling you they have failed.
* superclass changed to UiAutomatorBaseTest.
* added javadoc comments.