Added "afterMove" callback method

If you create your own behavior class which inherits UploadBehavior, you
can add any file-based operation in afterMove() callback method -- e.g.
Exif orientation process using ImageMagick convet tool, GD library
interface, or Imagick PECL packatge, etc.
Revert "Added "afterMove" callback method"

This reverts commit bad95676f7d44fea4ab0b3eee87f28d57a098bde.
Added "afterMove" callback method

If you create your own behavior class which inherits UploadBehavior, you
can add any file-based operations in afterMove() callback method -- e.g.
Exif orientation process using ImageMagick convert tool, GD library
interface, or Imagick PECL package, etc.
Merge pull request #36 from Masato-Kato/master

Request for adding "afterMove" callback method in UploadBehavior