feat(url): added buff.ly support to the url module

demo/index.html

@@ -46,7 +46,7 @@ <h1>Loading embed.js in a block</h1>
 else
 "C"
 ```
-Flavum, ferox http://open.spotify.com/track/4th1RQAelzqgY7wL53UGQt torquiss vix aperto de http://plnkr.co/edit/AK732k bi-color, http://www.iitr.ac.in/Main/assets/images/topold.jpg audax nixus.Pol, alter devatio!Crescere aliquando ducunt ad noster lixa. :smile: :P https://www.youtube.com/watch?v=bQRLVxZHKPs http://www.liveleak.com/view?i=42a_1426999994 https://gist.github.com/jeremiahlee/1748966 https://gist.github.com/thomasmb/7132686 https://twitter.com/ProductHunt/status/652826210666418176/photo/1 http://www.ted.com/talks/monica_lewinsky_the_price_of_shame http://www.dailymotion.com/video/x2k8un2_2015-wc-nz-vs-wi-holder-reacts-on-guptills-237_sport https://vine.co/v/bjHh0zHdgZT https://vimeo.com/119199079 http://www.w3schools.com/html/horse.mp3
+Flavum buff.ly/1fPIjQf , ferox http://open.spotify.com/track/4th1RQAelzqgY7wL53UGQt torquiss vix aperto de http://plnkr.co/edit/AK732k bi-color, http://www.iitr.ac.in/Main/assets/images/topold.jpg audax nixus.Pol, alter devatio!Crescere aliquando ducunt ad noster lixa. :smile: :P https://www.youtube.com/watch?v=bQRLVxZHKPs http://www.liveleak.com/view?i=42a_1426999994 https://gist.github.com/jeremiahlee/1748966 https://gist.github.com/thomasmb/7132686 https://twitter.com/ProductHunt/status/652826210666418176/photo/1 http://www.ted.com/talks/monica_lewinsky_the_price_of_shame http://www.dailymotion.com/video/x2k8un2_2015-wc-nz-vs-wi-holder-reacts-on-guptills-237_sport https://vine.co/v/bjHh0zHdgZT https://vimeo.com/119199079 http://www.w3schools.com/html/horse.mp3
 </div>
 <div id="block2" class="block">
 Cur rumor nocere?Emeritis adelphis satis perderes domina est.Gloss cadunt in bi-color brema!