[Dbix-class] Proposed patch and tests for a txn_do() method in Schema

[Justin Guenther]

Hello all,

Attached is a patch that I've worked out with the help of the good
people of #dbix-class. Its changes include:

- Added DBIx::Class::Storage class, with virtual methods that
DBIx::Class::Storage::DBI redefines
- Made DBIx::Class::Storage::DBI a subclass of DBIx::Class::Storage
- Added an exception class
DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION, which helps
DBIx::Class::Schema::txn_do() differentiate between a nested rollback
being propagated and a rollback failing.
- Added tests for txn_do(), including successful transactions
returning values in both scalar and list context, successful nested
transactions, failed transactions (both nested and not) and failed
transactions with a failed rollback

Comments? Suggestions? Anything I've missed as far as being
exception-safe is concerned?


   Justin Guenther
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