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Only enforce hook priority levels on plugin hooks.

Better documentation for settings.origin.

• Remove and/or use local polyfills (#204) by @gregod

Add in missing ; that caused compressed JS to error.

Major rework to the hydration code thanks to @gregod.

• All prop files are now prefetched by default.
• Move from .js to .json prop files to ease the parser's lifting.
• Turning off prefetch can be done with hydrate-options={{ noPrefetch: true }}
• Better parallelization of prop fetching.

Fix #196 and #197.

Stop props from being undefined via another angle. No implications... just doesn't look good.

When props are empty, don't outputundefined instead output an empty object.

Full details on #191.

Breaking changes around hydration, read PR before upgrading.

• Add minimumElderjsVersion to plugin initialization disabling the plugin if it isn't the correct version.
• Add version to the settings object.