Fix #423 "cloud service" link broken
Fixed seeds and fictures for rain notifier

The seed rain notifier wasn't using liquid templates so the
conditions and location showed up as literal strings.
Merge pull request #428 from andrewcurioso/master

Fixed seeds and fixtures for rain notifier
Merge pull request #427 from CloCkWeRX/fix_423

Fix #423 "cloud service" link broken
Percent-encode unsafe characters in a filename when composing each URL.
RssAgent accepts `headers`, `basic_auth` and `user_agent`.

These options are provided by WebRequestConcern.