[ticket/8960] Allow changing avatar path if it's not writable

This change will allow users to change the avatar path even if it's not
writable. However, this will get rid of the error message that the path is
not writable. Due to this, a minor addition to the explain message in the ACP
settings has been made.

PHPBB3-8960
[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."
[ticket/12413] Revert e65a6dd8f45d0ce4c8700fb68c19ac6268162aa0

"Merge remote-tracking branch 'dhruvgoel92/ticket/11271' into develop-olympus"

This reverts commit e65a6dd8f45d0ce4c8700fb68c19ac6268162aa0, reversing
changes made to 214f515e9ccc71e368882384fb38bd7135b0e40f.

PHPBB3-12413
Merge pull request #2341 from nickvergessen/ticket/12413

[ticket/12413] Revert e65a6dd8f45d0ce4c8700fb68c19ac6268162aa0 in olympus

* nickvergessen/ticket/12413:
  [ticket/12413] Revert e65a6dd8f45d0ce4c8700fb68c19ac6268162aa0
[ticket/12186] Move PM reports below post reports while installing

In mcp, move PM reports below post reports while installing.

PHPBB3-12186
Merge pull request #2319 from n-aleha/ticket/12186

[ticket/12186] Move PM reports below post reports while installing

* n-aleha/ticket/12186:
  [ticket/12186] Move PM reports below post reports while installing
Merge remote-tracking branch 'github-marc1706/ticket/8960-olympus' into develop-olympus

* github-marc1706/ticket/8960-olympus:
  [ticket/8960] Allow changing avatar path if it's not writable
[ticket/12467] Add config*.php and tests_config*.php to .gitignore

PHPBB3-12467
Merge pull request #2371 from nickvergessen/ticket/12467

[ticket/12467] Add config*.php and tests_config*.php to .gitignore

* nickvergessen/ticket/12467:
  [ticket/12467] Add config*.php and tests_config*.php to .gitignore