rsim/oracle-enhanced — pull request #121 by yahonda (2011-11-10 03:00:40+00:00)
Title: Add rename_constraint, rename_default_primary_key, rename_default_foreign_key methods

Add rename_constraint, rename_default_primary_key, rename_default_foreign_key methods and these tests.

At first I tried to modify oracle-enhanced to generate DDLs with non-default (SYS_C%) primary key
and foreign key name but I did not get how to do. Instead, implemented some methods to rename these constraints.

These tests have passed with Rails 3.1.1 with Oracle 11gR2 and Rails 3.0.9 with Oracle 10gR2.
I would be grateful if I can have your comments.