Backgrounding support#37

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runema wants to merge 3 commits intobsdphk:masterfrom

runema:background

Commits on Aug 7, 2017

Put ntimed-client in the background once the PLL is stable.
runema
committed

Commits on Aug 9, 2017

Make sure the process is backgrounded only once.
runema
committed

Commits on Aug 14, 2017

Update README. Backgrounding is implemented.
runema
committed