fix #5065
Http/Client: using injected response object
add unit test for \Zend\Http\Client::prepareHeaders
add inline doc for \Zend\Http\Client::prepareHeaders
add missing use for Zend\Uri\Http
Increase readability, fix indentation
Merge pull request #5071 from localheinz/hotfix/readability

Increase readability, fix indentation
Merge branch 'hotfix/5071'

Close #5071
Merge pull request #5068 from heik/master

using injected response object
Merge branch 'hotfix/5068'

Close #5068
Merge pull request #5065 from ClemensSahs/hotfix/5042

[Zend\Http\Client] dupplicate header keys in prepareHeaders

Conflicts:
	tests/ZendTest/Http/ClientTest.php
Merge branch 'hotfix/5065'

Close #5065