Add css: false to build tool integrations

[Rich-Harris]

• svelte-cli
• rollup-plugin-svelte
• sveltify
• gulp-svelte
• metalsmith-svelte
• system-svelte
• svelte-loader

Ref #153 (css: false prevents the compiler from generating code that adds <style> tags to the DOM – scoping attributes are retained on the assumption that the developer is already including the server-rendered scoped CSS)

[shinnn]

I just published gulp-svelte v0.2.0 and metalsmith-svelte v0.3.0. Both of them support css option.

I don't have permission to click the checkbox on #160 (comment) so I'd like one of the Svelte team members to click it instead of me.

[nikku]

Added to svelte-loader via sveltejs/svelte-loader@81ad83b.

[Rich-Harris]

Will close this now — I'm not totally sure how this would be done in Browserify and SystemJS loaders, cc'ing @TehShrike and @blittle in case this is actually fairly straightforward 😀

[TehShrike]

I can't think of a way for that to make sense in Browserify. 👍