Adding some more bloggers and external links

I welcome Surajit Basu, Sankrant Sanu, Ajoy Bhatia and Amitabh Thakur as fellow bloggers on this site. I have additionally linked the personal blogs of some of the IITK89 members to this blog including those of Pankaj Kumar, Amitabh Thakur, Ajoy, Sankrant Sanu and Surajit Basu ( all are distinguished members of IITK 89 batch). Welcome you all!!