Webhelpers

--------------
* Adding counter func to text helpers, patch from Jamie Wilkinson.
* Sync'd Rails Text helper to 4994.
* Sync'd Rails Asset tag helper to 4999.
* Sync'd Rails Form tag helper to 5045, also doesn't apply to our version.
* Sync'd Rails Javascript func to 5039, doesn't apply to us.
* Updated Scriptaculous to 1.6.3.
* Updated Prototype to 1.5.0_rc1.
* Updated radio_button so that id's are unique. Brings up to date with Rails
changeset 4925, also fixes 103.
* More precise distance_of_time_in_words (Follows bottom half of 4989 Rails
changeset)
* button_to accepts method keyword so you can PUT and DELETE with it.
(Follows 4914 Rails changeset)
* Fixed auto_link to parse more valid url formats (Thanks Jamie Wilkinson).
* Sync'd text helper from latest Rails version.
* Fixed form tag's method matching to be case insensitive.

-------------
* Adding simplejson req, adding use of json'ification. Updated scriptaculous
helpers to split out JS generation for use in JS Generation port.
* Finished sync'ing Rails ports (urls, tags) in WebHelpers. Closes 69.
url and prototype tests updated, url helpers updated to handle method
argument.
* Sync'd scriptaculous helper.
* Sync'd javascript, prototype helpers and prototype.js to latest Rails
modifications. Added more prototype tests.
* Sync'd form_options, form_tag helpers. form_tag's form function can now
accept other HTTP methods, and will include a hidden field for them if
its not 'get' or 'post'.
* Sync'd number helper, added number unit tests.
* Added markdown.py (python-markdown) for new markdown support in text helper.
* Added textile.py (PyTextile) for new textilize support in text helper.
* Brought asset/date/text helpers up to date with revision info.

---------------
* Brought feedgenerator in line with Django's version, which fixed the missing
support for feed categories and updated classes for new-style. Other minor
feed updates as well. Now synced as of Django r3143.
* Fixed typo in feedgenerator import, reported by tiksinfree.fr.
* Added ``webhelpers.rails.asset_tag``, for generating links to other assets
such as javascripts, stylesheets, and feeds.