Use slicing syntax instead of methods and add a feature gate#17620

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nrc wants to merge 4 commits intorust-lang:masterfrom

Commits on Oct 2, 2014

Use slice syntax instead of slice_to, etc.
Nick Cameron
committed
Remove the `_` suffix from slice methods.
Nick Cameron
committed
Put slicing syntax behind a feature gate.
Nick Cameron
committed
Review and rebasing changes
Nick Cameron
committed