bugfix: memcache extension wasn't loaded
bashizm: http://mywiki.wooledge.org/Bashism
Silence memcache install also for php 5.5 builds
https://github.com/yiisoft/yii/pull/927
https://github.com/yiisoft/yii/pull/931
Fixed formatting
Small formatting fix
Merge pull request #2125 from Ragazzo/Fixed-formatting-for-CPgsqlSchema

Fixed formatting for CPgsqlSchema
[ci skip]
Merge pull request #2124 from arvenil/fix-memcache-install-for-php-5.5

Fix memcache install for php 5.5 builds in travis