No spaces before quotes

[tradingaddict]

The detokenizer isn't prepending spaces before quotes like it says it should in the Tokenizer.py examples.
If I use one of the examples on the detokenizer:

["He", "said", "''", "heya", "!", "''", "yesterday", "."]

it returns:

He said"heya!" yesterday.

[tomaarsen]

Hello!

I think I've narrowed this down a bit:
With NLTK version 3.5:

>>> detokenize(["He", "said", "''", "heya", "!", "''", "yesterday", "."])
"He said ''heya!''  yesterday."

With NLTK version 3.6.7:

>>> detokenize(["He", "said", "''", "heya", "!", "''", "yesterday", "."])
'He said"heya!" yesterday.'

I'll workshop a quick fix to improve the performance a bit.

[tomaarsen]

I've got this quick testing script:

for sentence in ["Hello, you're Tom!",
                 'He said "heya!" yesterday.',
                 'He said \'heya!\' yesterday.',
                 'He said \'\'heya!\'\' yesterday.',
                 'He\'s doing well, I think.',
                 ]:
    token = tokenize(sentence)
    detoken = detokenize(token)
    print(detoken)

The new performance is:

Hello, you're Tom!
He said "heya!" yesterday.
He said 'heya! 'yesterday.
He said "heya!" yesterday.
He's doing well, I think.

versus the old performance:

Hello, you're Tom!
He said"heya!" yesterday.
He said 'heya! 'yesterday.
He said"heya!" yesterday.
He's doing well, I think.

(Note: using NLTK 3.6.7)

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