Small updates to development process documentation.
Merge pull request #13 from coinzen/belovachap_readme_update

Small updates to development process documentation.
add -l rt to unix makefile

Issue: http://coinzen.org/index.php/topic,951.msg34197.html#msg34197
was solved by linking in realtime click library, this is to support
dynamically linked builds
add libpng to qt build

libpng is dependency of libqrencode
Merge pull request #21 from coinzen/sidhujag

add libpng to qt build