Maintainers changed, moved to GitHub

I'm glad to announce a change of maintainers of this cppsphinxclient. We (me and urbanekv) work on another projects which do not use Sphinx any more and therefore we handed the cppsphinxclient over to our tech team at Seznam.cz. As other open source projects of Seznam.cz are moving to github https://github.com/seznam, so does the cppsphinxclient https://github.com/seznam/cppsphinxclient. Now there is more space for more active development, I'm looking forward to new versions. Most recent update is a version for debian-wheezy.