Fixing http://dev.ckeditor.com/ticket/10986

Hello  Frederico,

Please find in this pull request a starting solution for the Summary field in the table properties dialog.
Defect: http://dev.ckeditor.com/ticket/10986
Please note the following: 
- To set the text direction to LTR the user should type ALT+SHIFT+HOME
- To set the text direction to RTL the user should type ALT+SHIFT+End
Please note that we already use these same keys in IBM CKEditor.to set the text direction.

In the future we could block CRTL+SHIFT keystrokes.


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