stackoverflow reads.md

http://stackoverflow.com/questions/2307283/what-does-olog-n-mean-exactly/13093274#13093274
http://stackoverflow.com/questions/17195733/why-identityhashmap-uses-linear-probing-for-collision-resolution http://stackoverflow.com/questions/5378391/closing-a-blocking-queue
http://stackoverflow.com/questions/4632322/finding-all-possible-combinations-of-numbers-to-reach-a-given-sum
http://softwareengineering.stackexchange.com/questions/214889/is-an-event-loop-just-a-for-while-loop-with-optimized-polling