Merge pull request #16 from nsendetzky/master

Optimizes the CSS, prepares for Arcavias Core change and enables full page caching
Makes Zend library available via composer
Adapts bootstrapping of admin interface to support translations
Changes locale back to English
Updates to latest Arcavias core and Zend extension
Merge pull request #17 from nsendetzky/2014-01-31_admin-translation

Adapts bootstrapping of admin interface to support translations
Enables catalog search filter in left navigation filter