Rails core - Oct 2012 - Add posibility pass hash to ActiveReccord::Querying#order

Hi guys
I have added possibility pass hash to order method. Also i updated symbol 
parsing.
Here is the pull request - https://github.com/rails/rails/pull/7765
Can you please provide some feedback?

So the main idea is to convert symbol or hash into Arel::Nodes::Ordering 
instead of Arel::Nodes::SqlLiteral.
Arel::Nodes::Ordering object contain information about table - so we can, 
for example, change alias on the fly

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