remove '\' character from Traversable because already defined in 'use' statement
Zend\Db\Sql
- Added Quantifier support to Zend\Db\Sql\Select (DISTINCT, ALL and Expression)
fix invalid docblock
change @return  to @return ClassName
Merge branch 'fix/doc-traversable' of git://github.com/samsonasik/zf2 into hotfix/3679
Merge branch 'hotfix/3679'

Close #3679
Merge branch 'feature/db-select-quantifier' of git://github.com/ralphschindler/zf2 into hotfix/3682
Merge branch 'hotfix/3682'

Close #3682
Fixes #3455
Merge commit 'refs/pull/3687/head' of github.com:zendframework/zf2 into hotfix/phpdoc-return-type
Merge pull request #3687 branch 'hotfix/phpdoc-return-type'