downgraded gtk-tray to use gtk-2 libraries to stay out of systemd deps
Fixed the links to KNOWN_BUGS.md and doc/HACKING.txt documents. Close #176
Merge pull request #178 from JoelMon/fix-README-links

Fixed links to KNOWN_BUGS.md and doc/HACKING.txt documents. Close #176
typo fix for gpg 1.4.11 affecting mint 13 and ubuntu 12, closes #175