Blazeweb

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* fixed unicode handling for JSON parsing

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* add py.test plugin to load a blaze app for testing, similar to the nose plugin

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* exception_with_context() is now filtered for sensitive information. The filters can be
controlled through settings.

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* add json filter, support all json mimetypes that webtest does in the Request.json property

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* add FileResponse

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* added relative_path kwarg to link_css_url and source_js_url, default behavior
remains to use abs_static_url on the url