Solving https://bugs.launchpad.net/indicator-stickynotes/+bug/1258906
   - Running indicator-stickynotes twice will raise the first instance
   - I'm using the classic pid/flock method to run one instance at time
     and storing the PID of the instance so I can send a standard UNIX
     signal and handle it from the first instance to raise stickynotes
Merge branch 'master' of github.com:lesion/indicator-stickynotes