message: Updated bundler to rebase the main document.  This results in bundled documents having their base tags stripped, but all paths are correct.
diff: @@ -188,7 +188,9 @@ export class Bundler {
  bundleImports?: Set<string>): Promise<ASTNode> {
  const docUrl = docBundle.url;
  const document = await this._prepareBundleDocument(docBundle);
  +
  this._appendHtmlImportsForBundle(document, docBundle);
  + importUtils.rebaseDocument(docUrl, document);
  importUtils.rewriteImportedUrls(document, docUrl, docUrl);
  await this._inlineHtmlImports(docUrl, document, docBundle, bundleManifest);
  