Require missing libraries and check for defined ActionController constant so ActionView can be used standalone

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

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Fix Json related documentation for render and the AR serializer. Closes #9814. Closes #9833. [chuyeow]


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Added that render :json will automatically call .to_json unless its being passed a string [DHH] Added Mime::Type.register_alias for dealing with different formats using the same mime type [DHH]

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Added Request#format to return the format used for the request as a mime type. If no format is specified, the first Request#accepts type is used. This means you can stop using respond_to for anything else than responses [DHH]

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Added the option for extension aliases to mime type registration [DHH] Refactored default mime types to use the extension framework instead of just declaring themselves verbosely

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Added text/csv as a default mime type and included example on how to make your own in config/environment.rb [DHH]

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respond_to .html now always renders #{action_name}.rhtml so that registered custom template handlers do not override it in priority. 
Custom mime types require a block and throw proper error now.


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Added interrogation of params[:format] to determine Accept type. If :format is specified and matches a declared extension, like "rss" or "xml", that mime type will be put in front of the accept handler. This means you can link to the same action from different extensions and use that fact to determine output [DHH]

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Rendering xml shouldnt happen inside any layout. Added class proxying to RJS, so you can call page.field.clear("my_field") to generate Field.clear("my_field");. Added :content_type option to render, so you can change the content type on the fly. Do type/subtype reordering of Accept header preferences for xml types (aka make Firefox work with respond_to). CHANGED DEFAULT: The default content type for .rxml is now application/xml instead of type/xml, see http://www.xml.com/pub/a/2004/07/21/dive.html for reason

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Mime types are separated by a comma, not semicolon, in the Accept header. Also switch all internal configuration of mime types away from strings and over to Mime::Type [DHH]

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Added better support for using the same actions to output for different sources depending on the Accept header [DHH] Added Base#render(:xml => xml) that works just like Base#render(:text => text), but sets the content-type to text/xml and the charset to UTF-8 [DHH]

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