[Packager] Configure Babel with .babelrc

[jtremback]

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[johanneslumpe]

I don't think it's a good idea to have babel config in either .babel.rc or package.json. I'd just go for one to make it more explicit how to configure babel.

[jtremback]

I'm just going on how Babel itself can be configured. I think there are advantages to either one. I prefer putting any configuration I can in package.json, because then I can just copy n paste to start a new project.

[johanneslumpe]

@jtremback fair enough :)

[jtremback]

Ooops. @johanneslumpe I was totally wrong. Am changing the PR to only look for .babelrc.

[sebmck]

The .babelrc lookup and merging behaviour in this PR is not consistent with how Babel does it. Babel can already resolve .babelrc files itself by just specifying an absolute filename to babel.transform. Ref #1451.