added check_gzip_compression to commonrc, tests if Content-Encoding is used for given url
added check_gzip_compression to commonrc, tests if Content-Encoding is used for given url

reallifedigital/dotfiles,reallifedigital/dotfiles,reallifedesign/dotfiles,lmjabreu/dotfiles,lmjabreu/dotfiles,lmjabreu/dotfiles,reallifedesign/dotfiles,reallifedigital/dotfiles,reallifedesign/dotfiles