added snippet tag ($this->snippet()) cache and improved $this->inc() cache

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4087 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (3017) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4088 1f8fe7d8-47f0-464c-8d0a-336f4953ab05