I tried some days to implement the PWM-Library with Arduino Mega 2560 and IDE 1-6-11. No function - no PWM. After some luckless hours I had got the idea to use the source with the IDE 1-0-5. The LED demo worked immediately.
Really, you should have just commented on that thread instead of starting a new one. If you do find a solution to make it work with IDE 1.6.11 then please post an update to that thread describing what worked for you so that it might help anyone else encountering the same issue.