tinyCTF 2014: add ‘Elrond32’ write-up
tinyCTF 2014: link to @poerhiza’s write-ups

Closes #159.
CSAW CTF 2014: link to ‘obscurity’ write-up
ASIS CTF Finals 2014: add initial challenges
ASIS CTF Finals 2014: add some more challenges
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  ASIS CTF Finals 2014: add some more challenges
  ASIS CTF Finals 2014: add initial challenges
  CSAW CTF 2014: link to ‘obscurity’ write-up
  tinyCTF 2014: link to @poerhiza’s write-ups
  tinyCTF 2014: add ‘Elrond32’ write-up