Fully support PATCH like PUT and DELETE.

[oneiros]

Purpose

Full support for HTTP PATCH along the lines of PUT and DELETE as described in #884

Description

This adds the missing piece for PATCH to be treated just like PUT and DELETE. It can now be parsed from the special parameter _method that Rails-UJS sets on the specially crafted links (that lucky already generates correctly).

Checklist

• - An issue already exists detailing the issue/or feature request that this PR fixes
• - All specs are formatted with crystal tool format spec src
• - Inline documentation status has not gotten worse 😉
• - Lucky builds on docker with ./script/setup
• - All builds and specs pass on docker with ./script/test

[paulcsmith]

Thank you!!