Minor refactoring
Change to specific exception types
Remove PHP 5.5 build because of missing APC lib
Bugfixing for Travis APC installation
Bufix for APCu installation on Travis-CI
Bufix for APCu installation on Travis-CI
Bufix for APCu installation on Travis-CI
Bufix for APCu installation on Travis-CI
Merge pull request #1 from wagnert/master

Minor refactoring