Reapplies [8865] with some fixes


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Introduce the :readonly option to all associations. Records from the association cannot be saved. Closes #11084.


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Ensure that modifying has_and_belongs_to_many actions clear the query cache.  Closes #10840 [john.andrews]

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post.comments.reload returns the association rather than the result of load_target. Closes #10438 [Fred Cheung]


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Fixed that habtm associations should be able to set :select as part of their definition and have that honored [DHH]

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Make reset return nil when using a dangling belongs_to association.  Current behaviour is to return false which can be confusing. Closes #10293 [fcheung]


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Dynamic finders on association collections respect association :limit. Closes #10227 [Jack Danger Canty]


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Make Dynamic Finders on Association Collections Respect Association :order [patrick.t.joyce, technoweenie]. Closes #10211


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Fix HasManyThrough Association so it uses :conditions on the HasMany Association.  Closes #9729 [danger]

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Allow find on a has_many association defined with :finder_sql to accept id arguments as strings like regular find does. Closes #9916 [krishna]

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Refactor association create and build so before & after callbacks behave consistently. Closes #8854.


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Added ActiveRecord::Base#to_json/from_json (currently does not support :include like to_xml) [DHH]. Added ActiveRecord::Base#from_xml [DHH]

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Formatting, grammar and spelling fixes for the associations documentation. [seanhussey] Closes #8899


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