Remove cadmiumcr/utilities and merge its content in cadmiumcr/tokenizer

[rmarronnier]

@watzon :

No cadmium shard requires cadmiumcr/utilities without requiring cadmiumcr/tokenizer

I can't see a use case of a program requiring cadmiumcr/utilities by itself.

The content of cadmiumcr/utilities are really tokenizer relevant (sentence + stop words)

I see no issues in cadmiumcr/tokenizer becoming the "core" of cadmium.

[watzon]

Yeah that makes sense to me. Let's go ahead with it.