New: Allow other orderings of implements/extends clauses (fixes #361)

[j-f1]

This allows for classes like

class ClassWithParentAndInterface implements MyInterface extends MyOtherClass {}

which currently do not parse the extends clause.

Fixes #361.

[eslintbot]

Thanks for the pull request, @j-f1! I took a look to make sure it's ready for merging and found some changes are needed:

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Can you please update the pull request to address these?

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[eslintbot]

LGTM

[j-f1]

I can’t reproduce that error locally on Node 5. Closing and reopening to restart the build.

[JamesHenry]

LGTM, thanks!

[JamesHenry]

I think I'll class this as a bug fix when I merge, because this should have always been the behaviour rather than it being a new feature.

Thanks again!