Improve error message when run script fails

We now suggest re-running ./bootstrap to troubleshoot the issue.
Merge pull request #1328 from hypothesis/run-error-message

Improve error message when run script fails
Merge pull request #1325 from hypothesis/1311-isolate-static-assets

Isolate static assets in h:static
Revert "Remove dead code (Annotation methods in models.py)"

This reverts commit 7e6f2907c6f8b568f2bd7064cca4fe812e5c0ea7.
Support bundled/debug and unbundled/production

Close #1230