Fixes https://github.com/babel/babel-eslint/issues/603 (and the fixture from https://github.com/babel/babel-eslint/issues/609 works). Reworks our code that converts the format of Babylon template tokens to be a bit more robust, especially with things like nested templates with arrows. (Adapted the logic from https://github.com/eslint/espree/blob/master/lib/token-translator.js)