Docker instructions broken by sudoroom-data symlink

Looks like moving sudoroom-data outside the source dir broke the docker instructions.

> sudo-humans@0.0.0 start /usr/src/app
> bin/cmd.js

/usr/src/app/node_modules/mkdirp/index.js:90
                    throw err0;
                          ^
Error: EEXIST, file already exists '/usr/src/app/sudoroom-data'
    at Object.fs.mkdirSync (fs.js:651:18)
    at sync (/usr/src/app/node_modules/mkdirp/index.js:71:13)
    at Function.sync (/usr/src/app/node_modules/mkdirp/index.js:77:24)
    at Object.<anonymous> (/usr/src/app/bin/cmd.js:101:8)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)

npm ERR! Linux 4.4.0-66-generic
npm ERR! argv "node" "/usr/local/bin/npm" "start"
npm ERR! node v0.10.29
npm ERR! npm  v3.10.9
npm ERR! code ELIFECYCLE
npm ERR! sudo-humans@0.0.0 start: `bin/cmd.js`
npm ERR! Exit status 8
npm ERR! 
npm ERR! Failed at the sudo-humans@0.0.0 start script 'bin/cmd.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the sudo-humans package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     bin/cmd.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs sudo-humans
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls sudo-humans
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /usr/src/app/npm-debug.log

Oops.

sudoroom / sudo-humans

Docker instructions broken by sudoroom-data symlink #75