Update to alpine 3.6 and latest dokuwiki #24
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Updated to alpine 3.6 (solves PHP bug in alpine 3.5: docker-library/php#376) and dokuwiki 2017-02-19b.
Docker image running these changes is here: https://hub.docker.com/r/julakali/dokuwiki/
Added php7-openssl and php7-zlib for extension downloads and php7-mbstring to support the Dw2Pdf extension.