replaced pear's mime with a pimcore solution

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3661 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
asset document: optimized text extraction

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3662 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2895) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3663 1f8fe7d8-47f0-464c-8d0a-336f4953ab05