Enable SAINT for Custom Link Tracking reports

[#1]

The ability to classify my custom link reports (exit, download, and other) would be full of win.

When using the s.tl() function for custom tracking, we are already passing a link name as the third parameter (example: s.tl(this, 'o', 'Main Menu: Contact Us') ). The redundancy of copying the link name into a prop, setting it via s.linkTrackVars, and managing it seperately is too much to ask. Give us SAINT for our custom link data!