Fix defaults when dumping ruby schema#27

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bsedat wants to merge 3 commits intotlconnor:masterfrom

bsedat:feature/schema-dumping

Commits on Feb 28, 2013

Adding an Array#from_postgres_array spec
bsedat
committed
Adding some specs for String#from_postgres_array to test decimal, float, integer, and timestamp casting
bsedat
committed
Updating the ActiveRecord adapter to return the correct format for array columns that contain defaults
bsedat
committed