Fix #5726

[meghprkh]

Add support for SVG stroke-linejoin attribute

See #5726

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[zpao]

Note: we will probably not take this. We're working on an effort to allow all SVG attributes to pass through in #5714.

[meghprkh]

@zpao That's great. In fact I believe that you shall let all attributes pass through and just convert them from CamelCase to hifenated forms if react doesn't recognize the attribute. I believe that this should be closed then

[zpao]

👍 I'm going to leave it open for the time being and we'll close all of the SVG issues/PRs in bulk (to make sure we haven't missed anything).

[gaearon]

In fact I believe that you shall let all attributes pass through and just convert them from CamelCase to hifenated forms if react doesn't recognize the attribute

The current thinking in #5714 is not to be smart about it and to pass them through exactly as the user specifies. This way we don't need to care whether we are aware of all possible camel cased attributes that really are camel cased in the spec (there are quite a few!)

The existing camel cased attributes will work with a warning for another version.

[gaearon]

Verified that stroke-linejoin works in master when specified as is.