Making video in the center and not stretched when captions are shown.
Added auto hide/show for captions.
Removed old styling and debug info.
Added missing initalizations for captions auto show/hide.
Fixing bugs. Adding black backgorund to video for when it has not yet loaded. Making sure that the captions are not shown when in YouTube mode.
Added back missing styles for captions when in YouTube mode.
Code review 1 comments
Minor refactoring.
Documenting. Part 1.
