Merge pull request #1 from cfoellmann/master

proposal for "some" restructuring
Changed button to standard width instead of widefat
Removed prepend_attachment on widget content. Could cause weird issues 
where other post attachments image is added.
Removed filter to unregister widget
Small code style changes
Removed $control_ops in widget construct. It was causing issues and
I don't know what good that filter was for really anyway.
Fixed class name in widget init
Smal code style changes
Version bump and readme changes
Readme changes