Updating Seek Tests

##Rationale

##Changed Files
* Put in a way to definitively determine Playhead Position for Logs.
  * Progress event added in the setup method to allow all tests access to it.
* Ensured that testHideSeekControls would not pass unless the "Hide Seek Controls" event triggered for every ad break, rather than having to go back to check the logcat.
* Removed programatically skipping ads, as the new android native player snapshot prevents that.
* Added play event emitters to each test, as autoplay is no longer in effect.
* Added tests to check Play functionality in new classes PlayOnceTest and NoPlayTest.
  * One checking to see if "DID PLAY" is there when it should be there, one checking to see if "DID PLAY"
##Rationale

##Changed Files
* Remedied issue with wifi not turning back on for testAdDataReady in the MainActivityTest class
* NoPlayTest finished to determine if the Sample App is playing on its own.
* PlayOnceTest removed temporarily as it is nowhere near complete.
Removed comments around tests.
Removing an out of date comment
Made suggested changes and added some more thorough comments.
Added constants for progress posotions in testSeekControlsPostAdBreak.
Merge pull request #44 from BrightcoveOS/onceux-seek-tests

Added NoPlayTest, Tweaked MainActivityTest for OnceUX plugin