Merge #1041

1041: allow importing macros without helpers in the 2018 edition r=asomers a=euclio

~This PR adds the `$crate::` prefix to all uses of helper macros, which will allow users of the 2018 edition to import the macros without needing to also import their helpers.~

See https://doc.rust-lang.org/edition-guide/rust-2018/macros/macro-changes.html#macros-with-crate-prefix for more info.

~While this is a cleaner solution than using `#[macro_export(local_inner_macros)]`, it also requires bumping the minimum supported compiler version to 1.30. If this is acceptable, I'll add a commit to update the Travis configuration and docs.~

This PR now uses `local_inner_macros` to preserve compatibility with the current minimum Rust version.

Co-authored-by: Andy Russell <arussell123@gmail.com>

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