Comment extraction not working on curling quotes

[GMishx]

Curling quotes (“,”, ‘, ’) are not filtered in comment extractor which results in some wrong results.

A more extensive listing of problematic word characters:

Character	UTF-8	ASCII	Name
–	\u2013	-	EM DASH
—	\u2014	-	EM DASH
―	\u2015	-	Horizontal Bar
‘	\u2018	'	Left single quotation mark
’	\u2019	'	Right single quotation mark
‚	\u201a	,	Single low-9 quotation mark
‛	\u201b	'	Single high-reversed-9 quotation mark
“	\u201c	"	Left double quotation mark
”	\u201d	"	Right double quotation mark
„	\u201e	"	Double low-9 quotation mark
…	\u2026	...	Horizontal ellipsis
′	\u2032	'	Prime
″	\u2033	"	Double prime
©	\u00a9	(c)	Copyright sign

[amanjain97]

@GMishx Thanks for the issue. Please check #22