Update tokenizer.md for construction example
* Update tokenizer.md for construction example
Self contained example.  You should really say what nlp is so that the example will work as is
* Update CONTRIBUTOR_AGREEMENT.md
* Restore contributor agreement
* Adjust construction examples
@@ -16,11 +16,14 @@ Create a `Tokenizer`, to create `Doc` objects given unicode text.
> ```python
> # Construction 1
> from spacy.tokenizer import Tokenizer
+> from spacy.lang.en import English
+> nlp = English()
> tokenizer = Tokenizer(nlp.vocab)
>
> # Construction 2
> from spacy.lang.en import English
-> tokenizer = English().Defaults.create_tokenizer(nlp)
+> nlp = English()
+> tokenizer = nlp.Defaults.create_tokenizer(nlp)
> ```
| Name | Type | Description |
