Fix Tokenizer onattribend's endIndex

[DimaIT]

Fixes #1538

1. For NoValue attributes endIndex is set to attribute name's end index
2. For attributes with quotes endIndex moved one character forward to match actual attribute end

Output of the script from the ticket:

<a aaaaa   >
        ^
Attribute endIndex: 8

<a aaaaa >
        ^
Attribute endIndex: 8

<a a=aaa >
        ^
Attribute endIndex: 8

<a a="a" >
        ^
Attribute endIndex: 8

The fix makes endIndex consistent, however I'm a little bit worried that change for quoted attributes may be breaking for someone.

[coveralls]

Pull Request Test Coverage Report for Build 5535855124

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.655%

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Totals
Change from base Build 5534370930:	0.0%
Covered Lines:	1734
Relevant Lines:	1740

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💛 - Coveralls

[fb55]

Awesome PR, thanks so much @DimaIT!