Created updateName().

Working towards extensibility.
Modified updateName - Removed String return in favor of void in order to
be able to call it at any time.
Added an infinite while loop to recheck spotify's song name
Changed Thread.sleep delay.
Added additional check (lastKnownSong) to updateName()
Added updateFocus() and changed updateName() to private
Added code to updateFocus()
Currently displays the first overlay correctly. Then will not correctly
identify the next window. -- Need to figure out how to anchor it to a
new location - read further into the JavaDoc for the functionality of
this Component.
Merge branch 'master' of https://github.com/anboas/SpotifyOverlay