v0.4.0: #79 Embedded Annotation with Optional Column Prefix (#81)

* Added @Embedded annotation and use prefix for table creation. Next: Fix errors on SELECT.

* Added logic for SELECT columns to respect embedded prefixes.

* Added @Embedded prefix support for insert/update.

* Add documentation of functions explored.

* Organizing tests, adding more tests for embedded.

* Complete test coverage for embedded logic.

* Fix for MYSQL compilation flag in integration tests.

* One more fix for MySQL tests.

* Sigh... one more typo on Postgres config.

* Remove TODO statements that were left behind.