fix for custom builtins not being used when parsing rules

[mattmarshall]

Rule.rulesFromURL(String, BuiltinRegistry) does not pass the BuiltinRegistry argument to Rule.rulesParserFromReader(). This means that a user-specified builtin registry cannot be used with rules that are loaded using rulesFromURL(). This seems like a bug, so I can create a corresponding GitHub or JIRA issue, but wanted to first present this pull request. This is a simple one-line fix to pass registry into rulesParserFromReader(), along with some additional unit tests and a minor reorganization for some of the .rules files.

If you checkout just the TestRuleLoader.java unit test file from this PR, you can see that the load_from_file_with_custom_builtins() test fails. After adding the change to Rule.java, the test passes.

[afs]

Hi @mattmarshall, thanks for the PR.

Yes, please do create a GH issue or a JIRA.

[afs]

Looks good and the build is passing.

@der -- unless I heard otherwise, I'll merge this.

[der]

Yes, looks good to me. Thanks @mattmarshall

[mattmarshall]

Thanks for merging this @afs and @der. I hadn't gotten around to creating an issue for this yet, so I appreciate it!