Blazeweb

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* add auto-cleanup of beaker sessions for file/dbm storage (if applicable).
settings.beaker.auto_clear_sessions (default True) controls this function
* cleanup setup.py and add version.txt file, move to "extra_requires" for specifying developer
dependencies.

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* adjust setup_file_logging() to accept an argument for the settings object

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* add extra_context argument to View.render_json()

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* Fixed 0.4.5 regression: previously, a POST XHR would try for xhr() and then
post() on a view class, but 0.4.5 would only try for xhr().

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* add include_rst() and include_mkdn() as functions available in Jinja templates
* css and js from included templates is now always included, regardless of where
in the child template the include method is called.
* add "content" template filter which will merge css/js from the given content
object into the parent template
* add link_css_url(), source_js_url() and complimentary head_link_tags() and
head_script_tags() template functions to be able to include CSS/JS URLs from
any template.
* make HTTP request method handling more robust. Its now easier to respond to
request methods that are not GET/POST and we will now correctly return a 405
Method Not Allowed response when the view can not handle the request method
sent over.

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* fix a nasty bug in the View arg processing that can alter formencode validator
classes