Allow for more customization on user interaction #9
Description
Right now, there is only one real way to use the Shaker class. I feel we need to extend it to increase its flexibility and overall usefulness. This means that we need to abstract some of the functions to new functions, that connect to each other. This way, we allow users to build what they need with the API we provide them - instead of forcing them to follow our vision on tree shaking.
For users that do not wish this advanced usage of the internal API, we still should provide the functions that they need. Perhaps even by including new functions in __init__.py that allow users to quickly bulk or single optimize a file.