require pimple/pimple
Merge branch 'feature/pimple-di' into 0.5.x-dev
Move VF_SearchForm to VF_Search_Form
Require php >=5.3.0
Move VF_SearchLevel to VF_Search_Level
Refactor redundant initializations of VF_Schema() and referenced VF_Singleton::getInstance()->schema() instead
Refactor more redundant initializations of VF_Schema and referenced VF_Singleton::getInstance()->schema() instead