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don't assume the http authorization header will be nil, since some configurations will pass it through as an empty string


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Included the HttpAuthentication plugin as part of core (ActionController::HttpAuthentication::Basic) [DHH]

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Simplify API of assert_difference by passing in an expression that is evaluated before and after the passed in block. See documenation for examples of new API. [Marcel Molina Jr.]

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Document :allow_nil option for validates_acceptance_of since it defaults to true. Closes #8050. [tzaharia]

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Update documentation for :dependent declaration so that it explicitly uses the non-deprecated API. Closes #8069. [danger]

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Added short-hand declaration style to migrations (inspiration from Sexy Migrations, http://errtheblog.com/post/2381) [DHH] Updated resource_scaffold and model generators to use short-hand style migrations [DHH]

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Change Base#to_xml to take the name for a container element for an association from the element name, not the first record's class name.  Closes #7004

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Fixed that content_tag with a block will just return the result instead of concate it if not used in a ERb view #7857, #7432 [michael.niessner]

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Replace the current block/continuation filter chain handling by an implementation based on a simple loop.  #8226 [Stefan Kaes]

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BACKWARDS INCOMPATIBLE: Changed the finder API to be more extensible with :params and more strict usage of scopes [DHH] Added find-one with symbol [DHH]

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Added the first part of Simply Helpful to core. The rest is pending a clean integartion of polymorphic urls [DHH]

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Updated initializer to only load #{RAILS_ENV}.rb once. Added deprecation warning for config.breakpoint_server.

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