Replace table by span in a-tag because Internet Explorer can not follow the link by clicking in a/table-combination

Putting a table inside a hyperlink is not working in IE. In all browsers, hovering over the table shows a link is present.
However, in Internet Explorer, clicking the table has no effect. In other browsers, it follows the hyperlink as expected.
Added fix for Internet Explorer so links in navigation tree work
Merge pull request #2 from kysr/master

Added fix for Internet Explorer so links in navigation tree work