Fix uint overflow bugs in std::{at_vec, vec, str}#9108

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bluss wants to merge 7 commits intorust-lang:masterfrom

bluss:hazards-on-overflow

Commits on Sep 16, 2013

std::num: Add uint::next_power_of_two_opt
blake2-ppc
committed
std::vec: Fix hazards with uint overflows in unsafe code
blake2-ppc
committed
std::vec: Add function vec::bytes::push_bytes
blake2-ppc
committed
std::str: Add bench tests for StrVector::connect() and for str::push_str
blake2-ppc
committed

Commits on Sep 17, 2013

std::str: Fix overflow problems in unsafe code
blake2-ppc
committed
rt::io: Use vec::reserve_additional
blake2-ppc
committed
std::at_vec: Fix segfault on overflow when resizing ~[@T]
blake2-ppc
committed