Mocha: before description removal

[Vanuan]

In mocha this is a valid before hook:

beforeEach('some initialization', () => {

});

In jasmine this fails with the error:

    TypeError: originalBodyFn.apply is not a function

      at Object.fn (node_modules/jest-jasmine2/build/jasmine-async.js:64:44)

I.e. transformer should remove descriptions from before/after hooks.

[skovhus]

Thanks for reporting this! Feel free to submit a pull request, maybe you want to give it a try? : )