Implemented optional subdomains with regex
Fix PHPDoc
Has child doesn't make sense for Hostname route
Matched length is not needed for Hostname route
Merge branch 'hotfix/3839'

Close #3839
Close #3825
Fixes #2477
[2.1.2] Prepared for release

- Updated changelog
- Updated Zend\Version
- Updated readme
Merge branch 'releases/2.1.2'

2.1.2 readiness
Version bump

- Bump to 2.1.3dev
Merge branch 'version/bump'

Bump to 2.1.3dev