Addition of viewing timer code
Few bug fixes to sleep timer function
Change option to idle-timeout
Fix option to OPT_INT not OPT_BOOL
Idle takes into account button/key presses to reset idle counter
Pops alert 1 minute before sleep using OSD to warn user
Update example config entry
Tidy variable names, fix couple of bugs
Change to minutes not seconds and set defaults
Merge pull request #30 from andyb2000/viewingtimer

Viewingtimer/Sleeptimer