Add tl;dr pages query

dotfiles/bmo/uris.ini

     ud      = http://www.urbandictionary.com/define.php?term=%s
     the     = http://www.thesaurus.com/browse/%s
     tfd     = http://www.thefreedictionary.com/%s
+    tldr    = http://www.ostera.io/tldr.jsx/#/%s
     w       = http://en.wikipedia.org/wiki/%s
     wa      = https://www.wolframalpha.com/input/?i=%s