Added transaction support

- Inflating objects are now wrapped in 'schema->txn_do'.
- Method formdata_to_object_hash added, use this when dealing with multiple objects, or really always.
- Fixed bug when has_many was specified without foreign id argument.
Added missing build dependency
Really add missing dependency.
Removed dependency Debug::ShowStuff.
Updated version to 0.0.8
Updated Build.PL to not create Makefile.PL anymore.
Updated change log.
Updated change log and bumped version to 0.0.9.