Update scenes to show picture ads on load
Add isReady handling to ShowAd method

ShowAd returns a boolean value based on the value returned by the
isReady method.
Reverse game IDs for readability

Game IDs have been updated server-side to reflect their purpose in the
editor. Testing profiles come first, followed by production profiles.
Separate profiles keep stats split between testing and production modes.
Yield for one second rather than every frame
Correct metro package name and app description

Update for consistency. This project was previously named the Super
Awesome Unity Ads Demo.
Use _yieldTime variable in place of values
Upated header comment to match file name
Merge branch 'development'