Commits on Mar 17, 2015

1. Migrate `next_*` methods to return `Option` …

   In the Rust standard library, the `next` method on the `Iterator` trait
   returns an `Option`. Prior to this commit, the `next` and `next_*`
   methods return `Err<_, ()>`. In an attempt to make some of the code more
   idiomatic, I migrated these methods to return `Option` instead.

   

   frewsxcv committed Mar 17, 2015

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