Fix strict standard warnings.

WordPress does no type hinting, mine was too good. :(
Merge branch 'master' of github.com:toscho/WP-Magic-Widgets
Update readme to version 2014.03.22.
Disable PHPStorm inspection for the dummy text.
Fix return values
Fix wrong doc block for return value in get_visibility_options().
Add class "code" to the textarea. Fixes #5
change line endings to UNIX
Add a widget title. Fixes #3

 The title will be used in the back-end only.
 It helps to identify different widgets, but it will not be used
 to render the widget content in sidebars.
Make the title getter method protected, so the class can be extended. *sigh* See #3
Update changelog.
Update stable tag