nginx/addons: make blocklist redirect optional
marketplace/nginx: redirect amo/blocklist to blocklist endpoint.
Merge pull request #38 from oremj/addons-optional-blocklist

Addons: optional blocklist
zamboni: add spartacus to marketplace instances
marketplace:nginx: add /fxa-authorize to marketplace conf. thanks ashort.
marketplace: add sync_packaged_apps util
solitude: add buyeremail aes key
dreadnot: add username on completion message
dreadnot: had reverse logic in hubot user prefix code
rename hearth to src for marketplace's fireplace