merged branch lyrixx/php55 (PR #8559)

This PR was merged into the 2.2 branch.

Discussion
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[Tests] Tests on php 5.5 should pass

Because php 5.5 is stable now

Commits
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0086ee3 [Tests] Tests on php 5.5 should pass

.travis.yml

@@ -6,10 +6,6 @@ php:
   - 5.4
   - 5.5
 
-matrix:
-  allow_failures:
-    - php: 5.5
-
 before_script:
     - echo '' > ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/xdebug.ini
     - sh -c 'if [ $(php -r "echo PHP_MINOR_VERSION;") -le 4 ]; then echo "extension = apc.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'