CSAW CTF 2014: add ‘Twitter will you give me @kchung?’ write-up

Closes #145.
tinyCTF 2014: add placeholders
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  tinyCTF 2014: add placeholders
  CSAW CTF 2014: add ‘Twitter will you give me @kchung?’ write-up