Merge pull request #2848 from bantu/ticket/12948

[ticket/12948] Remove no longer needed opcache workaround. Travis has 5.5.15
[ticket/12953] Page title not updated when notifications are marked as read

PHPBB3-12953
[ticket/12671] Possibility to use NOT LIKE expression

PHPBB3-12671
[ticket/12929] Update to RC4

PHPBB3-12929
[ticket/12930] Update to RC4

PHPBB3-12930
[ticket/12928] Update to RC4

PHPBB3-12928
Merge pull request #2840 from marc1706/ticket/12742

[ticket/12742] Put duplicated code into one method in notifications base
[ticket/12831] reimplemented headers as array

https://tracker.phpbb.com/browse/PHPBB3-12831

PHPBB3-12831
Merge pull request #2854 from bantu/ticket/12954

[ticket/12954] Correctly setup PATH_INFO on Travis CI.

* bantu/ticket/12954:
  [ticket/12954] Correctly setup PATH_INFO on Travis CI.
Merge pull request #2691 from dhruvgoel92/ticket/11528

[ticket/11528] Revert all mink changes in functional tests

* dhruvgoel92/ticket/11528:
  [ticket/11528] Revert Mink changes
[ticket/8064] Change the collation of topic_first_poster_name

PHPBB3-8064
Merge pull request #2849 from bantu/ticket/12941

[ticket/12941] Check for Sami parse errors on Travis CI.

* bantu/ticket/12941:
  [ticket/12941] Fix remaining Sami complaints.
  [ticket/12941] Check for Sami parse errors on Travis CI.
  [ticket/12941] Add sami.conf.php for Travis CI.
[ticket/12938] Remove functional tests for 'Download all attachments'.

PHPBB3-12938
Merge pull request #2851 from marc1706/ticket/12949

[ticket/12949] Check if mime_content_type is actually callable
[ticket/12831] simplified code, upd event block

https://tracker.phpbb.com/browse/PHPBB3-12831

PHPBB3-12831
[ticket/12956] Ensure the contact columns have been added before using them

PHPBB3-12956
[ticket/12831] fix CS

https://tracker.phpbb.com/browse/PHPBB3-12831

PHPBB3-12831
Merge remote-tracking branch 'github-nicofuma/ticket/8064' into develop-ascraeus

* github-nicofuma/ticket/8064:
  [ticket/8064] Change the collation of topic_first_poster_name
Merge pull request #2852 from bantu/ticket/12938

[ticket/12938] Remove the 'Download all attachments' feature.

* bantu/ticket/12938:
  [ticket/12938] Remove functional tests for 'Download all attachments'.
  [ticket/12938] Remove the 'Download all attachments' feature.
Merge pull request #2855 from Geolim4/ticket/12953

[ticket/12953] Page title not updated when notifications are marked as read

* Geolim4/ticket/12953:
  [ticket/12953] Page title not updated when notifications are marked as read