Addition of attribute handles as link titles

When developing with attributes a common task is to look up for
existing attributes their handles for use in code.

This change adds to the lists of attributes within the dashboard, the
attribute handle as a title attribute.

This means that instead of a developer having to repeatedly view the
edit page an attribute just to see the handle, they can mouse-over the
links to see this.
Merge pull request #1585 from Mesuva/Addition-of-attribute-handles-as-title-attributes

Addition of attribute handles as link titles