:sparkles: Error out on partial bower packages

[KnownSubset]

Did you confirm this fix/feature is something that is needed? Yeah, you suggested it at #75

Did you write automated tests? Yeah, I've update the bower tests

Did you add documentation for the changes you made? No, this is a silent thing

In lieu of a style guide, did you match your code style to the rest of the project? Yes

[KnownSubset]

@quaertym Any movement on this?