Replace _action_view with view_context to reflect that it is public and that it does not need to be an ActionView instance

Make sure javascript_include_tag/stylesheet_link_tag does not append ".js" or ".css" onto external urls [#1664 state:resolved]
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

  * convert_content_type! is handled by assign_default_content_type_and_charset!
  * set_content_length! should be handled by the endpoint server. Otherwise
    each middleware that modifies the body has to do the expensive work of
    recalculating content_length.
  * convert_language! appears to be legacy. There are no tests for this
  * convert_cookies! should be handled by the new HeaderHash in Rack
  * Use an integer for .status's internal representation to avoid needing to
    do String manipulation just to find out the status

  * Significantly simplifies setting and modifying cache control in other areas

[#2661 state:resolved]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Fix tag helpers so that all HTML element boolean attributes render according to the specs. Added all boolean attributes listed in the XHTML 1.0 specs (http://www.w3.org/TR/xhtml1/guidelines.html) and HTML 5 specs (http://www.whatwg.org/specs/web-apps/current-work). HTML 5 boolean attribute rendering was broken in commit 1e2d7229 / [#2864 state:resolved].
Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Signed-off-by: NYehuda Katz <wycats@gmail.com>

Refactor Responder to only calculate available mime types. Those are sent to the controller that knows what to do with it (render a block or call default render).
Signed-off-by: NYehuda Katz <wycats@gmail.com>

  - Define to_model on AR
  - Define to_model on ActiveModel::APICompliant
  - Update test fixtures to be API Compliant
  - Start using to_model in AP

Adds a audio_tag helper for the HTML5 audio tag. Fixed video_path docs. HTML attributes values should be true or false not attribute's name. [#2864 state:resolved]
Signed-off-by: NYehuda Katz <wycats@yehuda-katzs-macbookpro41.local>

Signed-off-by: NYehuda Katz + Carl Lerche <ykatz+clerche@engineyard.com>