2018-04-23 v0.5.3
* release simply to add missing CHANGES notes

2018-04-23 v0.5.2
* fixed #2 thanks to @jeremyevans
* added Redis as cache wrapper thanks to @brigriffin

2016-09-04 v0.5.1
* added the ability to stop a crawl

2016-05-13 v0.5.0
* fixed #1 thanks to @eribertomota
* got it running on more recent versions of ruby
* cleaned up the docs a bit
* cleaned up the licensing and attribution

2009-05-21
* fixed an issue with robots.txt on ssl hosts
* fixed an issue with pulling robots.txt from disallowed hosts
* fixed a documentation error with ExpiredLinks
* Many thanks to Brian Campbell

2008-10-09
* fixed a situation with nested slashes in urls, thanks to Sander van der Vliet and John Buckley

2008-07-06
* Trap interrupts and shutdown gracefully
* Support for custom urls-to-crawl objects
* Example AmazonSQS urls-to-crawl support (next_urls_in_sqs.rb)

2007-11-09:
* Handle redirects that assume a base URL.

2007-11-08:
* Move spider_instance.rb, robot_rules.rb, and included_in_memcached.rb into
  spider subdirectory.

2007-11-02:
* Memcached support.

2007-10-31:
* Add `setup' and `teardown' handlers.
* Can set the headers for a HTTP request.
* Changed :any to :every .
* Changed the arguments to the :every, :success, :failure, and code handler.

2007-10-23:
* URLs without a page component but with a query component.
* HTTP Redirect.
* HTTPS.
* Version 0.2.1 .

2007-10-22:
* Use RSpec to ensure that it mostly works.
* Use WEBrick to create a small test server for additional testing.
* Completely re-do the API to prepare for future expansion.
* Add the ability to apply each URL to a series of custom allowed?-like
  matchers.
* BSD license.
* Version 0.2.0 .

2007-03-30:
* Clean up the documentation.

2007-03-28:
* Change the tail recursion to a `while' loop, to please Ruby.
* Documentation.
* Initial release: version 0.1.0 .
