Bug fix: NER pipeline shouldn't group separate entities of same type
## Effects
nlp=pipeline('ner', ... , grouped_entities=True)

## Fixes 
Separate entities of same type shouldn't be grouped together even if they are same type 
( B-type1 B-type1 ) != ( B-type1 I-type1 )

## Example 
"something something Istanbul Los Angeles something something"

Current output: [ (O O) (B-type1 B-type1 I-type1) (O O) ]
Fixed output: [ (O O) (B-type1) (B-type1 I-type1) (O O) ]



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