Update functions in Result and Either to be iterator-based#8526

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bluss wants to merge 3 commits intorust-lang:masterfrom

bluss:either-result

Commits on Aug 15, 2013

std: Change either::{lefts, rights} to return an iterator
blake2-ppc
committed
Update either::partition
blake2-ppc
committed
std: Replace map_vec, map_vec2, iter_vec2 in std::result
blake2-ppc
committed