libcore: Add range_step and range_rev functions.#4313

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huonw wants to merge 2 commits intorust-lang:incomingfrom

huonw:range_rev_and_step

Commits on Jan 10, 2013

libcore: Add range_step and range_rev functions.
huonw
committed

Commits on Jan 11, 2013

libcore: Correct behaviour of range_step for uint, tests for range* functions.
huonw
committed