Fixed Cancel Button on "Add SoundCloud Track" Dialog, Changed LICENSE and README

Fixed the cancel button on the Add SoundCloud Track dialog in Movable
Type 5.0 and later.  License changed from BSD to MIT, which makes it
consistent with the other SuperAssets plugins.
Correct References to Name of Plugin within the Plugin Code Itself

Changed the name of the plugin directory from SoundCloudAssets to
SuperAssetsForSoundCloud. Change references in config.yaml and related
files in the same manner.
Merge branch '1.0'