No follow all snaps

Added a new method to the LinkTo object that will print the href and a rel=nofollow for external links.
We used to just output the Snap links verbatim. This time, I'm forcing it to go through the wash like all the other links. 

HOWEVER: this is not the method that will provide the rel=nofollow flag. That is handled by the "getHrefWithRel" method.