Regenerate all bundles and trigger an HMR page reload when a new bundle is created#2762
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Fixes #1224.
When a new bundle is created, perhaps due to a CSS file being imported from JS, the HTML needs to be regenerated to insert a tag for that new bundle. Previously this was not happening because the hash of the HTML bundle did not change so parcel did not re-package it. Now we invalidate this whenever there is a new bundle created.
In addition, we need to reload the page with HMR since the HTML could be modified.