Support for displaying URIs as link in the results table

Hi, I added support for displaying values which represent an URI as links
(anchors) in the HTML table. This way, the values which represent an URI can be browsed directly from the results of the tool, just as users are supposed to in a Linked Data / Semantic Web scenario.

For instance, if we browse [this example](http://bit.ly/11kyJGJ), the values in the cells are currently displayed as text. The goal is to display them [as they are here](http://bit.ly/18J3Gtq), so that the user can continue browsing data from other places on the web.

It's a small change, but we believe it may be important.