git lfs

Hi, @mathiasbynens

The size of write-up's repo is growing more and more day by day which is not a good option for hosting it on github as it suggests to keep the repo under 1gb [source](https://help.github.com/articles/what-is-my-disk-quota/) and also for people who are trying to clone it as it will be dam slow; so why don't we create a new repo called write-up-2015 so that we can add all the ctf's done in 2015 to this repo so that it makes the write-ups more organised and we need not add the 2015 options in the end of every ctf name

Also we can organise our repo as in [shell-storm](http://shell-storm.org/repo/CTF/CSAW-2014/) ie.. sort them using the category name even though it is mentioned in the readme file. So that it becomes easy for people who focus on a particular topic as one will not solve all the challenges of the ctf and he need not look through all the challenges under the ctf to see what he likes (as the name gives very less about the type of challenge)
Also inside the category of the challenge the challenge name will be ending with the score of the challenge which is also a good thing to follow :+1:
Also one more good thing about the shell-storm is that it contains the score board :+1: which increase the spirit of the ctf

So what do you say?? Hope these things will be implemented which makes this repo more organised and friendly to use. :smile: