*new_feature: delete items with custom filter

[faryar76]

This pull request updates the query::class to support delete query results using custom filter.

$db->query()->where('name','LIKE','john')->delete(function($item){

        return $item->name=='0John' && $item->[email protected];

});

[coveralls]

Pull Request Test Coverage Report for Build 134

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 92.952%

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Totals
Change from base Build 130:	0.03%
Covered Lines:	488
Relevant Lines:	525

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💛 - Coveralls

[timothymarois]

This looks good. Nice Job! I will have this merged with the next update. Thanks!