Priority for extractors

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #107 
| License       | MIT
| Doc PR        | need to be written
It's better to chain when adding elements, that way you don't have to sort each time you want to extract (and the extractors array won't be changed unless another one will be added in the addExtractor method)