Signed-off-by: NMichael Koziarski <michael@koziarski.com>

[#1144 state:committed]

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Refactor ActiveSupport::JSON to be less obtuse.  Add support for JSON decoding by way of Syck with ActiveSupport::JSON.decode(json_string).  Prevent hash keys that are JavaScript reserved words from being unquoted during encoding.

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Update Object.subclasses_of to locate nested classes. Update Object.remove_subclasses_of to use Class.remove_class.

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Fix Object.subclasses_of to only return currently defined objects (closes #3882) [Jonathan Viney <jonathan@bluewire.net.nz>]

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Added reusable reloading support through the inclusion of the Relodable module that all subclasses of ActiveRecord::Base, ActiveRecord::Observer, ActiveController::Base, and ActionMailer::Base automatically gets [DHH]. Added auto-loading support for classes in modules, so Conductor::Migration will look for conductor/migration.rb and Conductor::Database::Settings will look for conductor/database/settings.rb [Nicholas Seckar]. Refactored extensions to module, class, and object in active support [DHH]

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Changed 0.blank? to false rather than true since it violates everyone's expectation of blankness.  Closes #2518, Closes #2705.

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Fixed memory leak with Active Record classes when Dependencies.mechanism = :load #1704 [c.r.mcgrath@gmail.com]

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Remove fix against memory leaks in development mode as it killed development performance on large applications (2-3s stall on Basecamp). Octopod is working on a better fix.

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Fixed memory leak with Object#remove_subclasses_of, which inflicted a Rails application running in development mode with a ~20KB leak per request #1289 [c.r.mcgrath@gmail.com]

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Added Errors#add_on_blank which works like Errors#add_on_empty, but uses Object#blank? instead. CHANGED: validates_presence_of now uses Errors#add_on_blank, which will make "  " fail the validation where it didnt before #1309. Added that "   " is now also blank? (using strip if available)

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Improved error reporting especially around never shallowing exceptions. Debugging helpers should be much easier now #980 [Nicholas Seckar]

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Added Object#blank? -- see http://redhanded.hobix.com/inspect/objectBlank.html #783 [_why the lucky stiff]

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Added methods for removing subclasses -- couldnt make it work with the regular nested-module approach (ObjectSpace was being difficult), so this is a straight inclusion

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