en.planet - add gsoc student feeds

+ Pragun Bhutani - http://blog.pragunbhutani.in/feed.xml
+ Kothari Harsh - https://kothariharsh.wordpress.com/tag/wikimedia/feed/

request from [[meta:Planet_Wikimedia]] by Nemo

Change-Id: I4d30320de673bf05457632bc8811d2c9e9649507
Merge "en.planet - add gsoc student feeds" into production