S4 fixup#4

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jameshilliard wants to merge 16 commits intobitmaintech:masterfrom

jameshilliard:s4-fixup

Commits on Oct 6, 2014

Allow arbitrary clamping of lower device diffs for slow controllers by driver

ckolivas
authored and
jameshilliard
committed
add mindiff to bitmain driver
jameshilliard
committed
Set min_diff to 1

ckolivas
authored and
jameshilliard
committed

Commits on Oct 18, 2014