Expose BabelCompiler.prototype.processOneFileForTarget.
Expose BabelCompiler.prototype.processOneFileForTarget.

This method is intended to help compiler plugins other than ecmascript
process inputFiles using the BabelCompiler.

For example: https://github.com/meteor/meteor/pull/6691

chasertech/meteor,4commerce-technologies-AG/meteor,chasertech/meteor,mjmasn/meteor,mjmasn/meteor,4commerce-technologies-AG/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,chasertech/meteor,Hansoft/meteor,mjmasn/meteor,Hansoft/meteor,mjmasn/meteor,jdivy/meteor,chasertech/meteor,4commerce-technologies-AG/meteor,jdivy/meteor,jdivy/meteor,chasertech/meteor,Hansoft/meteor,4commerce-technologies-AG/meteor,jdivy/meteor,mjmasn/meteor,Hansoft/meteor,jdivy/meteor,4commerce-technologies-AG/meteor,Hansoft/meteor,chasertech/meteor,Hansoft/meteor,chasertech/meteor,4commerce-technologies-AG/meteor,jdivy/meteor,jdivy/meteor,mjmasn/meteor,Hansoft/meteor