Add collapse_phrases option to displacy (closes #2266)

spacy/displacy/__init__.py

@@ -86,6 +86,10 @@ def parse_deps(orig_doc, options={}):
     doc = Doc(orig_doc.vocab).from_bytes(orig_doc.to_bytes())
     if not doc.is_parsed:
         user_warning(Warnings.W005)
+    if options.get('collapse_phrases', False):
+        for np in list(doc.noun_chunks):
+            np.merge(tag=np.root.tag_, lemma=np.root.lemma_,
+                    ent_type=np.root.ent_type_)
     if options.get('collapse_punct', True):
         spans = []
         for word in doc[:-1]:

website/api/_top-level/_displacy.jade

@@ -157,6 +157,12 @@ p
             |  as it prevents long arcs to attach punctuation.
         +cell #[code True]
 
+    +row
+        +cell #[code collapse_phrases]
+        +cell bool
+        +cell Merge base noun phrases into one token.
+        +cell #[code False]
+
     +row
         +cell #[code compact]
         +cell bool