[Danger] Switch to Danger JS #trivial

[orta]

Ruby is so 2015.

This moves us to DangerJS 0.0.10 - which should be enough to not be annoying. Does have rough edges though probably. It is enough to be usable in production IMO.

This is the first time I've tried using require in a DangerJS file, so err, our milage there may vary.

[orta]

Aww:

> emission@1.1.1 danger /home/travis/build/artsy/emission
> danger
OK
module.js:440
    throw err;
    ^
Error: Cannot find module './travis'
    at Function.Module._resolveFilename (module.js:438:15)
    at Function.Module._load (module.js:386:25)
    at Module.require (module.js:466:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/travis/build/artsy/emission/node_modules/danger/distribution/ci_source/ci_source.js:11:15)
    at Module._compile (module.js:541:32)
    at Object.Module._extensions..js (module.js:550:10)
    at Module.load (module.js:456:32)
    at tryModuleLoad (module.js:415:12)
    at Function.Module._load (module.js:407:3)

[orta]

OK, so it was a syntax error in my Dangerfile

[orta]

OK, this is good to go on green.