Updates to support rfuse 1.1.0

rfuse now provides the grunt work for FuseFS.main and  support
  for re-entrant signal handlers - including defaults for INT, TERM

Signed-off-by: lwoggardner <grant@lastweekend.com.au>
Rspec 3
Cleanup documentation
Merge branch 'master' of github.com:lwoggardner/rfusefs