added some features to sortable_columns#1

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Commits on Feb 8, 2011

added ability to define sortable_methods on an object, letting you sort by columns plus named methods
Al Davidson
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scoped method call
Al Davidson
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can now add sortable_methods :method_1, :method_2 on an AR class, to allow sorting by methods (not just columns)
Al Davidson
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Commits on Feb 10, 2011

sort_params now preserves existing params on links
Al Davidson
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add before_filter to ApplicationController so that it automatically preserves params
Al Davidson
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fixed bug with nil sortable_methods
Al Davidson
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Commits on Feb 11, 2011

took out debug code
Al Davidson
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Commits on Nov 3, 2011

no longer deletes sort_by and order from params in the sortable_order call - this enables a view template to interrogate those params and e.g. display appropriate icons
Al Davidson
committed