Enable cache purge by URL

[indolering]

The CloudFlare API allows you to purge individual files. The CDN would be much more useful if we could purge certain files on demand. The simplest option would be to setup a site that allows people to just submit a URL for purging and rate limit based on IP address.

[neoascetic]

Simply use tag or hash in the file path instead of branch name, as written in TTL section of FAQ. It is a good thing to lock your dependencies in production.