Fix warning about renamed missing doc attribute.
Merge pull request #19 from jbcrail/fix-missing-doc-warning

Fix warning about renamed missing doc attribute.
parse_bytes has been removed, use from_str_radix instead

see rust-lang/rust#18536
Merge pull request #21 from japaric/from-str

parse_bytes has been removed, use from_str_radix instead
bigint: Refactor the `parse_bytes` and `from_str_radix`.

This follows the changes of "Separate string->integer implementation in strconv" (rust-lang/rust@138b76b).
This allows `parse_bytes` to be removed without breaking `libnum` code.
Use sliciing_syntax
Fix lint name warning
Merge pull request #22 from gifnksm/master

bigint: Remove `parse_bytes` method
Update to latest rustc
Merge pull request #23 from gifnksm/master

Update to latest rustc