fix some 404 home pages in old blog post

Author: SethTisue

Diff for: gsoc/2014.md

@@ -112,7 +112,7 @@ Mentored by [Vlad Ureche][mb13] and [David Hall][mb14].
 [mb10]: https://en.wikipedia.org/wiki/Java_bytecode
 [mb11]: https://infoscience.epfl.ch/record/188060
 [mb12]: https://github.com/miniboxing/miniboxing-plugin
-[mb13]: https://people.epfl.ch/vlad.ureche
+[mb13]: http://vladureche.ro
 [mb14]: http://dlwh.org/
 
 ### MacroGL library
@@ -224,8 +224,7 @@ efficiently in Scala. Deliverables are the following:
   docs, overview of different features with descriptions, a getting
   started guide, and several example use cases
 
-Mentored by [Aleksandar
-Prokopec](https://people.epfl.ch/aleksandar.prokopec)
+Mentored by [Aleksandar Prokopec](http://aleksandar-prokopec.com)
 
 
 ### Generic XML interpolator
@@ -330,7 +329,7 @@ When working on the project you will:
 Luckily there are other macro-related ideas to hack on during GSoC.
 Contact Eugene for more information.*
 
-Mentored by [Eugene Burmako](https://people.epfl.ch/eugene.burmako)
+Mentored by [Eugene Burmako](https://github.com/xeno-by)
 
 ### Refactor Scaladoc's Scalac dependencies
 Scaladoc currently has strong dependencies on the Scala compiler's internal classes.