Update jest and babel-jest

[pioug]

I started to dive in the code looking for a way to contribute so I updated jest 😀

• Enable automock in jsmediatags-test.js https://facebook.github.io/jest/blog/2016/09/01/jest-15.html#disabled-automocking
• Configure fake timers https://facebook.github.io/jest/blog/2016/09/01/jest-15.html#real-vs-fake-timers
• Reset module cache explictly in XhrFileReader-test.js https://facebook.github.io/jest/blog/2016/09/01/jest-15.html#module-registry-persistence
• Replace scriptPreprocessor with transform https://github.com/facebook/jest/blob/master/CHANGELOG.md#jest-1700
• Replace pit with it https://github.com/facebook/jest/blob/master/CHANGELOG.md#jest-1800

[aadsm]

Oh man, this is awesome!! thank you so much ❤️.

PS: these facebook projects are getting better and better every day coff ;).