[WiP] Support node v6.2.0

[michielbdejong]

No description provided.

[michielbdejong]

Switching node from v6.9.1 to v6.2.0 makes several integration tests fail, as follows:

[michiel@mbp ~/gh/interledgerjs/ilp (mj-support-node-v6.2.0)]$ docker run -it michielbdejong/five-bells-integration-test /bin/bash
server starting
 * Starting Apache httpd web server apache2                                                                                                                                          AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
 *
root@81f18fe9aeb7:/app# nvm install 6.2.0
Downloading and installing node v6.2.0...
Downloading https://nodejs.org/dist/v6.2.0/node-v6.2.0-linux-x64.tar.xz...
######################################################################## 100.0%
Computing checksum with sha256sum
Checksums matched!
Now using node v6.2.0 (npm v3.8.9)
root@81f18fe9aeb7:/app# src/bin/integration test index


  Basic
ledger:3001 > five-bells-ledger@20.1.1 start /app/integration-test/node_modules/five-bells-ledger
ledger:3001 > node src/app.js

[...]


  1 passing (11s)
  11 failing

  1) Basic send universal payment transfers the funds (by destination amount):
     Error: Invalid IV length
      at Error (native)
      at new Cipheriv (crypto.js:184:16)
      at Object.Cipheriv (crypto.js:182:12)
      at Object.aesEncryptBuffer (node_modules/ilp/src/utils/crypto.js:61:12)
      at createDetails (node_modules/ilp/src/utils/details.js:54:20)
      at Object.createPacketAndCondition (node_modules/ilp/src/lib/transport.js:29:19)
      at Object.createPacketAndCondition (node_modules/ilp/src/lib/ipr.js:36:20)
[...]

[michielbdejong]

Continued in #93