[ticket/12345] Improve search flood interval message for ascraeus

Show to guests and users the remaining seconds until their next allowed
search, if a search flood limit is enabled for them.

PHPBB3-12345
[ticket/12121] Preserve link redirect counts when updating from 3.0.x.

PHPBB3-12121
[ticket/12417] Revert "No longer allow Travis CI HHVM environment to fail."

hhvm-nightly 2014.04.16~precise introduced "Attempted to serialize
unserializable builtin class DOMElement" errors when running functional tests.

This reverts commit ff7cc77f9db66b7fddacd77f215d85cf0243b2fa.

PHPBB3-12417
Merge pull request #2324 from bantu/ticket/12417

[ticket/12417] Revert "No longer allow Travis CI HHVM environment to fai...

* bantu/ticket/12417:
  [ticket/12417] Revert "No longer allow Travis CI HHVM environment to fail."
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/12417] Revert "No longer allow Travis CI HHVM environment to fail."
Merge pull request #2243 from n-aleha/ticket/12345

[ticket/12345] Improve search flood interval message for ascraeus

* n-aleha/ticket/12345:
  [ticket/12345] Improve search flood interval message for ascraeus
Merge pull request #2318 from prototech/ticket/12121

[ticket/12121] Preserve link redirect counts when updating from 3.0.x.

* prototech/ticket/12121:
  [ticket/12121] Preserve link redirect counts when updating from 3.0.x.