Send version tag to Sentry

Based on `core.js`'s hash
You generally do them this way, avoids "compiling" the regex each time and the `m.group(1)` stuff

    val Version = """/([a-z\d]{32})/[^/]*$""".r

    def getHash(path: String): String = apply(path).toString match {
      case Version(version) => version
      case _ => ""
    }